Finding the Fourth Proportional to 31,129.50, 42,958.71 and 16,982.40

Step by Step Solution

1. Step 1: Write the proportion equation
   31,129.50 : 42,958.71 = 16,982.40 : x
2. Step 2: Convert to fraction form
   31,129.50/42,958.71 = 16,982.40/x
3. Step 3: Cross multiply
   31,129.50x = 42,958.71 × 16,982.40
4. Step 4: Simplify right side
   31,129.50x = 729,541,996.70
5. Step 5: Solve for x
   x = 729,541,996.70/31,129.50
6. Step 6: Final answer
   x = 23,435.71