Finding the Fourth Proportional to 31,115.71, 42,937.99 and 17,685.10

Step by Step Solution

1. Step 1: Write the proportion equation
   31,115.71 : 42,937.99 = 17,685.10 : x
2. Step 2: Convert to fraction form
   31,115.71/42,937.99 = 17,685.10/x
3. Step 3: Cross multiply
   31,115.71x = 42,937.99 × 17,685.10
4. Step 4: Simplify right side
   31,115.71x = 759,362,495.39
5. Step 5: Solve for x
   x = 759,362,495.39/31,115.71
6. Step 6: Final answer
   x = 24,404.47