Edit: turns out that gold find fortune 20 and in general from hirling doesn't actually add to the total gold find since gold find doesn't seem to average but luck and item drops does. That means if you add gold find to a main character in a hirling setup, it will use up mainly your slots alot. Luck and item drops can be on any character which saves space .
Maybe the adventure page seems bugged since I can get 812% cap luck (1012% with fortunate) without actually getting properly 812% luck per character on mythic 3. I mean it's still 1012% luck but not fully .
I may need to redo this guide since fortune 20 Gold Find on Hirling doesn't apply to the actual average gold find.
Screenshots here: http://forums.dungeon-quest.com/t/im-confused/17922/6?u=cuzegspiked