Finding the Fourth Proportional to 31,116.47, 42,939.02 and 17,685.86

Step by Step Solution

1. Step 1: Write the proportion equation
   31,116.47 : 42,939.02 = 17,685.86 : x
2. Step 2: Convert to fraction form
   31,116.47/42,939.02 = 17,685.86/x
3. Step 3: Cross multiply
   31,116.47x = 42,939.02 × 17,685.86
4. Step 4: Simplify right side
   31,116.47x = 759,413,193.13
5. Step 5: Solve for x
   x = 759,413,193.13/31,116.47
6. Step 6: Final answer
   x = 24,405.51