The answer to this questions depends on context. We need to know what is on the program and what you intend to play. Eg: I once had to play in a Schubertiade. I was playing D. 946 Nr.1 and the rest of the pieces were vocal with piano. The program was approxamately 1 hr in length. The director decided to put me in the half way point as an interlude between all the songs. It was quite an effective programming arrangement.
If that is the complete program I would put you in the middle. The Pathetique is filled with passion. The preludes would contrast well and give a change of atmposhere. Fantasie Impromptu would be good after the Gershwin. If there is more, please post the complete program and we will see how well the other pieces may fit.
Perform as second perform is cool.. To perform as first person might get you more nervous than you are and to perform as last person sucks (my experience).. Second or middle is cool