Finding the Fourth Proportional to 31,071.20, 42,879.10 and 16,924.96

Step by Step Solution

1. Step 1: Write the proportion equation
   31,071.20 : 42,879.10 = 16,924.96 : x
2. Step 2: Convert to fraction form
   31,071.20/42,879.10 = 16,924.96/x
3. Step 3: Cross multiply
   31,071.20x = 42,879.10 × 16,924.96
4. Step 4: Simplify right side
   31,071.20x = 725,726,902.83
5. Step 5: Solve for x
   x = 725,726,902.83/31,071.20
6. Step 6: Final answer
   x = 23,356.90