A 4-period investment project has the following cash flows at times t = 0, 1, 2, 3, and 4 (all cash flows in dollars): -1, 12, -30, 39, and 76, respectively. Complete the triangle for this project and then answer the following question pertaining to the bottom row of numbers; i.e., the row below the horizontal line.

Reading the numbers of the bottom row of the triangle from left to right, what is the value of the fourth number?