Finding the Fourth Proportional to 1,078.49, 1,488.90 and 658.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.49 : 1,488.90 = 658.94 : x
2. Step 2: Convert to fraction form
   1,078.49/1,488.90 = 658.94/x
3. Step 3: Cross multiply
   1,078.49x = 1,488.90 × 658.94
4. Step 4: Simplify right side
   1,078.49x = 981,088.32
5. Step 5: Solve for x
   x = 981,088.32/1,078.49
6. Step 6: Final answer
   x = 909.69