Finding the Fourth Proportional to 31,112.15, 42,937.31 and 17,687.61

Step by Step Solution

1. Step 1: Write the proportion equation
   31,112.15 : 42,937.31 = 17,687.61 : x
2. Step 2: Convert to fraction form
   31,112.15/42,937.31 = 17,687.61/x
3. Step 3: Cross multiply
   31,112.15x = 42,937.31 × 17,687.61
4. Step 4: Simplify right side
   31,112.15x = 759,458,305.29
5. Step 5: Solve for x
   x = 759,458,305.29/31,112.15
6. Step 6: Final answer
   x = 24,410.35