Finding the Fourth Proportional to 1,078.20, 1,488.02 and 658.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.20 : 1,488.02 = 658.82 : x
2. Step 2: Convert to fraction form
   1,078.20/1,488.02 = 658.82/x
3. Step 3: Cross multiply
   1,078.20x = 1,488.02 × 658.82
4. Step 4: Simplify right side
   1,078.20x = 980,337.76
5. Step 5: Solve for x
   x = 980,337.76/1,078.20
6. Step 6: Final answer
   x = 909.24