Finding the Fourth Proportional to 86,057.38, 129,008.31 and 30,640.42

Step by Step Solution

1. Step 1: Write the proportion equation
   86,057.38 : 129,008.31 = 30,640.42 : x
2. Step 2: Convert to fraction form
   86,057.38/129,008.31 = 30,640.42/x
3. Step 3: Cross multiply
   86,057.38x = 129,008.31 × 30,640.42
4. Step 4: Simplify right side
   86,057.38x = 3,952,868,801.89
5. Step 5: Solve for x
   x = 3,952,868,801.89/86,057.38
6. Step 6: Final answer
   x = 45,932.94