Finding the Fourth Proportional to 87,142.72, 130,656.72 and 57,470.08

Step by Step Solution

1. Step 1: Write the proportion equation
   87,142.72 : 130,656.72 = 57,470.08 : x
2. Step 2: Convert to fraction form
   87,142.72/130,656.72 = 57,470.08/x
3. Step 3: Cross multiply
   87,142.72x = 130,656.72 × 57,470.08
4. Step 4: Simplify right side
   87,142.72x = 7,508,852,150.94
5. Step 5: Solve for x
   x = 7,508,852,150.94/87,142.72
6. Step 6: Final answer
   x = 86,167.29