Finding the Fourth Proportional to 1,078.67, 1,488.57 and 659.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.67 : 1,488.57 = 659.05 : x
2. Step 2: Convert to fraction form
   1,078.67/1,488.57 = 659.05/x
3. Step 3: Cross multiply
   1,078.67x = 1,488.57 × 659.05
4. Step 4: Simplify right side
   1,078.67x = 981,042.06
5. Step 5: Solve for x
   x = 981,042.06/1,078.67
6. Step 6: Final answer
   x = 909.49