Finding the Fourth Proportional to 1,078.85, 1,488.24 and 659.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.85 : 1,488.24 = 659.41 : x
2. Step 2: Convert to fraction form
   1,078.85/1,488.24 = 659.41/x
3. Step 3: Cross multiply
   1,078.85x = 1,488.24 × 659.41
4. Step 4: Simplify right side
   1,078.85x = 981,356.62
5. Step 5: Solve for x
   x = 981,356.62/1,078.85
6. Step 6: Final answer
   x = 909.63