Finding the Fourth Proportional to 31,139.71, 42,972.96 and 16,992.86

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139.71 : 42,972.96 = 16,992.86 : x
2. Step 2: Convert to fraction form
   31,139.71/42,972.96 = 16,992.86/x
3. Step 3: Cross multiply
   31,139.71x = 42,972.96 × 16,992.86
4. Step 4: Simplify right side
   31,139.71x = 730,233,341.92
5. Step 5: Solve for x
   x = 730,233,341.92/31,139.71
6. Step 6: Final answer
   x = 23,450.23