Finding the Fourth Proportional to 103,542.31, 142,900.15 and 57,606.50

Step by Step Solution

1. Step 1: Write the proportion equation
   103,542.31 : 142,900.15 = 57,606.50 : x
2. Step 2: Convert to fraction form
   103,542.31/142,900.15 = 57,606.50/x
3. Step 3: Cross multiply
   103,542.31x = 142,900.15 × 57,606.50
4. Step 4: Simplify right side
   103,542.31x = 8,231,976,776.47
5. Step 5: Solve for x
   x = 8,231,976,776.47/103,542.31
6. Step 6: Final answer
   x = 79,503.51