Finding the Fourth Proportional to 31,115.72, 42,937.98 and 17,685.11

Step by Step Solution

1. Step 1: Write the proportion equation
   31,115.72 : 42,937.98 = 17,685.11 : x
2. Step 2: Convert to fraction form
   31,115.72/42,937.98 = 17,685.11/x
3. Step 3: Cross multiply
   31,115.72x = 42,937.98 × 17,685.11
4. Step 4: Simplify right side
   31,115.72x = 759,362,684.79
5. Step 5: Solve for x
   x = 759,362,684.79/31,115.72
6. Step 6: Final answer
   x = 24,404.47