Finding the Fourth Proportional to 2,391.25, 3,587.07 and 659.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.25 : 3,587.07 = 659.89 : x
2. Step 2: Convert to fraction form
   2,391.25/3,587.07 = 659.89/x
3. Step 3: Cross multiply
   2,391.25x = 3,587.07 × 659.89
4. Step 4: Simplify right side
   2,391.25x = 2,367,071.62
5. Step 5: Solve for x
   x = 2,367,071.62/2,391.25
6. Step 6: Final answer
   x = 989.89