Finding the Fourth Proportional to 93,776.20, 129,471.53 and 83,687.31

Step by Step Solution

1. Step 1: Write the proportion equation
   93,776.20 : 129,471.53 = 83,687.31 : x
2. Step 2: Convert to fraction form
   93,776.20/129,471.53 = 83,687.31/x
3. Step 3: Cross multiply
   93,776.20x = 129,471.53 × 83,687.31
4. Step 4: Simplify right side
   93,776.20x = 10,835,123,648.85
5. Step 5: Solve for x
   x = 10,835,123,648.85/93,776.20
6. Step 6: Final answer
   x = 115,542.37