Finding the Fourth Proportional to 1,078.95, 1,488.98 and 659.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.95 : 1,488.98 = 659.31 : x
2. Step 2: Convert to fraction form
   1,078.95/1,488.98 = 659.31/x
3. Step 3: Cross multiply
   1,078.95x = 1,488.98 × 659.31
4. Step 4: Simplify right side
   1,078.95x = 981,699.40
5. Step 5: Solve for x
   x = 981,699.40/1,078.95
6. Step 6: Final answer
   x = 909.87