Hi,
A fallout is always at Visit level hence Page View isn't an option available because it won't hep define Fallout.
As far as I can understand by your question statement, it seems you want to check how many different pages Visitors viewed before reaching the checkout page to complete the transaction. If yes, then you should use any of the Page Flow reports, whichever best suits your data need.
If you have a different requirement, kindly elaborate.