It may either be satisfied from (slow) main memory, or all the sharing caches could respond, bombarding the requestor with redundant responses.
In this case, a request for the line is satisfied (less efficiently, but still correctly) from main memory.
The order in which the states are listed has no significance other than to make the acronym MESIF pronounceable.
There are other techniques for satisfying read requests from shared caches while suppressing redundant replies, but having only a single designated cache respond makes it easier to invalidate all copies when necessary to transition to the Exclusive state.
The F state in the MESIF protocol is simply a way to choose one of the sharers of a clean cache line to respond to a read request for data using a direct cache-to-cache transfer instead of waiting for the data to come from the main memory.