Finding the Fourth Proportional to 71,531.80, 98,713.92 and 39,700.72

Step by Step Solution

1. Step 1: Write the proportion equation
   71,531.80 : 98,713.92 = 39,700.72 : x
2. Step 2: Convert to fraction form
   71,531.80/98,713.92 = 39,700.72/x
3. Step 3: Cross multiply
   71,531.80x = 98,713.92 × 39,700.72
4. Step 4: Simplify right side
   71,531.80x = 3,919,013,698.02
5. Step 5: Solve for x
   x = 3,919,013,698.02/71,531.80
6. Step 6: Final answer
   x = 54,787.01