Finding the Fourth Proportional to 31,116.71, 42,939.37 and 17,686.10

Step by Step Solution

1. Step 1: Write the proportion equation
   31,116.71 : 42,939.37 = 17,686.10 : x
2. Step 2: Convert to fraction form
   31,116.71/42,939.37 = 17,686.10/x
3. Step 3: Cross multiply
   31,116.71x = 42,939.37 × 17,686.10
4. Step 4: Simplify right side
   31,116.71x = 759,429,991.76
5. Step 5: Solve for x
   x = 759,429,991.76/31,116.71
6. Step 6: Final answer
   x = 24,405.86