can i use peachtree on a mac pro ?

The following link to an article from Sage support indicates that they do not have a Mac version but gives information on how to run it under Windows on a Mac: https://www.sagemember.com/kb/kb.dll/ViewArticle?ID=10048

Yes, by running Windows on yur Mac.

You can run Windows bia Apple Boot Camp or run Windows as a virtual mach on top of OSX with a virtual machine like Palallers,or VirtualBox. You have to purchase the Windows media and some virtual machine sottware is also paid

https://www.sagemember.com/kb/kb.dll/ViewArticle?ID=10048