Finding the Fourth Proportional to 31,139.02, 42,972.02 and 16,992.17

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139.02 : 42,972.02 = 16,992.17 : x
2. Step 2: Convert to fraction form
   31,139.02/42,972.02 = 16,992.17/x
3. Step 3: Cross multiply
   31,139.02x = 42,972.02 × 16,992.17
4. Step 4: Simplify right side
   31,139.02x = 730,187,869.08
5. Step 5: Solve for x
   x = 730,187,869.08/31,139.02
6. Step 6: Final answer
   x = 23,449.29