[1][2][3] Fornaroli began karting competitively in his native Italy around the age of ten, first winning the Mini Academy class of the Championkart championship in 2016 before moving up to X30 Junior the following year.

[4] He came runner-up in the 2017 X30 Challenge Italy, in a season that also included entry to international IAME events, but found more success in 2018, when he was third in the Italian Karting Championship and made his full-time European debut in the WSK Super Master Series.

[5] Fornaroli's final year in karting would prove to be his best, as he was a front-runner in the 2019 WSK Euro Series on his OK debut and finished 3rd in the prestigious Trofeo Andrea Margutti.

[6][7] At the end of the year, he was invited to participate in the 16th edition of the annual Supercorso Federale event at Vallelunga, as one of five young karting talents selected by ACI Sport and the Ferrari Driver Academy.

[8][9] Having tested a Formula 4 car for the first time at the Supercorso Federale, 2020 would see Fornaroli make his debut in the Italian F4 Championship, driving for sportscar racing team Iron Lynx, which extended its program to single-seaters.

[13] At the end of the year, as an award for his performances, Fornaroli was again invited to ACI Sport's Supercorso Federale, together with F4 rivals Gabriele Minì, Francesco Pizzi, Andrea Rosso and four karting drivers.

Two very strong weekends at Misano, where he clinched his first F4 victory from his first pole before scoring two further podiums,[16] and Imola would initially see Fornaroli as the only real threat for eventual champion Oliver Bearman.

[18] The weekend did not go to plan for him, as he faced a lowly ninth position, a retirement and a DNS that eventually dropped him to fifth in the standings, behind runner-up Tim Tramnitz and Prema's Kirill Smal and Sebastián Montoya.

[21] In 2022 Fornaroli made the step up to Formula Regional, first doing a partial campaign in the Asian Championship for Hitech Grand Prix, with a fourth-place qualifying result and a fifth-place finish as highlights,[22] before returning to Europe for the main season with new team Trident, alongside F4 rival Tramnitz and Roman Bilinski.

[25][26] At the end of September 2022, Fornaroli partook in the FIA Formula 3 post-season test with Trident, partnering Oliver Goethe and FRECA rival Gabriel Bortoleto on all three days.