Finding the Fourth Proportional to 9,118.16, 12,584.40 and 5,580.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.16 : 12,584.40 = 5,580.80 : x
2. Step 2: Convert to fraction form
   9,118.16/12,584.40 = 5,580.80/x
3. Step 3: Cross multiply
   9,118.16x = 12,584.40 × 5,580.80
4. Step 4: Simplify right side
   9,118.16x = 70,231,019.52
5. Step 5: Solve for x
   x = 70,231,019.52/9,118.16
6. Step 6: Final answer
   x = 7,702.32