Yes, those numbers look quite daunting. I'll repeat,
I don't know if it will be possible to cater in the very highest chapters. Costs aren't set in stone, however, they depend on the city setup; so while your and
@iamthouth 's screenshots are really interesting and informative (thanks for sharing, both of you), they're likely not representative of the costs I or any other cautious caterer will experience when we get that far. Your city for example, Darielle, is only 3 chapters ahead of mine (very soon to be 2, only 3 techs to go!) yet has 182 more wonder levels and 63 more expansions than I do: 70-75% bigger on both counts! Your costs will naturally be immensely higher than mine. I don't see any further wonders I really want to build (certainly not 5 full ones!), and even accounting for ascended good manufactories and some growth of other basic buildings
and adding new event buildings, I can't imagine a scenario where I would have added more than another, oh, 20? expansions by then. That means my costs (and those of any caterer who planned from the get-go) should be
much lower than yours when I do get there.
Long way to say: everyone's costs are sure to be different, even at the exact same place in the research tree.