Finding the Fourth Proportional to 31,086.28, 42,899.07 and 16,939.13

Step by Step Solution

1. Step 1: Write the proportion equation
   31,086.28 : 42,899.07 = 16,939.13 : x
2. Step 2: Convert to fraction form
   31,086.28/42,899.07 = 16,939.13/x
3. Step 3: Cross multiply
   31,086.28x = 42,899.07 × 16,939.13
4. Step 4: Simplify right side
   31,086.28x = 726,672,677.35
5. Step 5: Solve for x
   x = 726,672,677.35/31,086.28
6. Step 6: Final answer
   x = 23,375.99