Please help I will award brainless to whoever helps please it’s urgent

The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?

Can someone me out here number 4 plz

I’m confused on how to work the pie charts