Finding the Fourth Proportional to 87,715.71, 121,061.31 and 57,588.42

Step by Step Solution

1. Step 1: Write the proportion equation
   87,715.71 : 121,061.31 = 57,588.42 : x
2. Step 2: Convert to fraction form
   87,715.71/121,061.31 = 57,588.42/x
3. Step 3: Cross multiply
   87,715.71x = 121,061.31 × 57,588.42
4. Step 4: Simplify right side
   87,715.71x = 6,971,729,566.03
5. Step 5: Solve for x
   x = 6,971,729,566.03/87,715.71
6. Step 6: Final answer
   x = 79,480.97