Finding the Fourth Proportional to 31,128.13, 42,957.13 and 16,981.27

Step by Step Solution

1. Step 1: Write the proportion equation
   31,128.13 : 42,957.13 = 16,981.27 : x
2. Step 2: Convert to fraction form
   31,128.13/42,957.13 = 16,981.27/x
3. Step 3: Cross multiply
   31,128.13x = 42,957.13 × 16,981.27
4. Step 4: Simplify right side
   31,128.13x = 729,466,622.96
5. Step 5: Solve for x
   x = 729,466,622.96/31,128.13
6. Step 6: Final answer
   x = 23,434.32