CREATE TABLE table_64107 ("School" TEXT, "Location" TEXT, "Mascot" TEXT, "Size" FLOAT, "IHSAA Class" TEXT, "# / County" TEXT, "Year Joined" FLOAT, "Previous Conference" TEXT)

What's the previous conference of Fountain City with a size more than 287?
SELECT "Previous Conference" FROM table_64107 WHERE "Size" > '287' AND "Location" = 'fountain city'
SELECT "Previous Conference" FROM "table_64107" WHERE "Location" = 'fountain city' AND "Size" > '287'