Finding the Fourth Proportional to 31,086.40, 42,902.31 and 17,658.49

Step by Step Solution

1. Step 1: Write the proportion equation
   31,086.40 : 42,902.31 = 17,658.49 : x
2. Step 2: Convert to fraction form
   31,086.40/42,902.31 = 17,658.49/x
3. Step 3: Cross multiply
   31,086.40x = 42,902.31 × 17,658.49
4. Step 4: Simplify right side
   31,086.40x = 757,590,012.11
5. Step 5: Solve for x
   x = 757,590,012.11/31,086.40
6. Step 6: Final answer
   x = 24,370.46