Finding the Fourth Proportional to 31,118.52, 42,943.37 and 17,689.78

Step by Step Solution

1. Step 1: Write the proportion equation
   31,118.52 : 42,943.37 = 17,689.78 : x
2. Step 2: Convert to fraction form
   31,118.52/42,943.37 = 17,689.78/x
3. Step 3: Cross multiply
   31,118.52x = 42,943.37 × 17,689.78
4. Step 4: Simplify right side
   31,118.52x = 759,658,605.12
5. Step 5: Solve for x
   x = 759,658,605.12/31,118.52
6. Step 6: Final answer
   x = 24,411.78