can you please explain the details of this problem?

Binder Corp. has invested in new machinery at a cost of $1,450,000. This investment is expected to produce cash flows of $640,000,$920,455,$823,330, and $907,125 over the next four years. What is the payback period for this project? 3.00 years 2.12 years 3.52 years 4.00 years 1.88 years