Finding the Fourth Proportional to 31,086.90, 42,899.76 and 16,939.62

Step by Step Solution

1. Step 1: Write the proportion equation
   31,086.90 : 42,899.76 = 16,939.62 : x
2. Step 2: Convert to fraction form
   31,086.90/42,899.76 = 16,939.62/x
3. Step 3: Cross multiply
   31,086.90x = 42,899.76 × 16,939.62
4. Step 4: Simplify right side
   31,086.90x = 726,705,632.49
5. Step 5: Solve for x
   x = 726,705,632.49/31,086.90
6. Step 6: Final answer
   x = 23,376.59