Finding the Fourth Proportional to 1,078.79, 1,488.72 and 659.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.79 : 1,488.72 = 659.16 : x
2. Step 2: Convert to fraction form
   1,078.79/1,488.72 = 659.16/x
3. Step 3: Cross multiply
   1,078.79x = 1,488.72 × 659.16
4. Step 4: Simplify right side
   1,078.79x = 981,304.68
5. Step 5: Solve for x
   x = 981,304.68/1,078.79
6. Step 6: Final answer
   x = 909.63