There are nine wonders in the city that generate a tourism bonus:
Pyramids (1575BC) Oracle (1525BC) MoM (1200BC) and GLib (1150BC) gain the maximum of 14gpt each for being over 2500yo.
TOA (875BC) gains a further 12gpt
The Hanging Gardens (710BC) generates 10gpt
Sistine (290BC) 4gpt
JSB (110AD) and Shakespeare (310AD) just about qualify for tourism with 2 gpt each.
This gives a total of 86 gpt tourism. (See how important the five earliest wonders are as they generate as much income as the whole city does through working the tiles.)
i.e the total base commerce for this city is 68+86= 154gpt.
As research is at 100% the rest of the sums are pretty straightforward. An additional 50% of the base commerce is added on for a lib, a uni and a lab. Also an additional 100% of this sum is added on for the three science wonders (Copers, Newton and SETI) giving a total bonus of 450%.
154*5.5 = 847 beakers per turn.