Finding the Fourth Proportional to 1,031.15, 1,423.60 and 658.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.15 : 1,423.60 = 658.71 : x
2. Step 2: Convert to fraction form
   1,031.15/1,423.60 = 658.71/x
3. Step 3: Cross multiply
   1,031.15x = 1,423.60 × 658.71
4. Step 4: Simplify right side
   1,031.15x = 937,737.91
5. Step 5: Solve for x
   x = 937,737.91/1,031.15
6. Step 6: Final answer
   x = 909.41