Finding the Fourth Proportional to 31,129.57, 42,957.86 and 17,518.38

Step by Step Solution

1. Step 1: Write the proportion equation
   31,129.57 : 42,957.86 = 17,518.38 : x
2. Step 2: Convert to fraction form
   31,129.57/42,957.86 = 17,518.38/x
3. Step 3: Cross multiply
   31,129.57x = 42,957.86 × 17,518.38
4. Step 4: Simplify right side
   31,129.57x = 752,551,900.68
5. Step 5: Solve for x
   x = 752,551,900.68/31,129.57
6. Step 6: Final answer
   x = 24,174.82