Finding the Fourth Proportional to 8,986.16, 12,400.56 and 5,007.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,986.16 : 12,400.56 = 5,007.20 : x
2. Step 2: Convert to fraction form
   8,986.16/12,400.56 = 5,007.20/x
3. Step 3: Cross multiply
   8,986.16x = 12,400.56 × 5,007.20
4. Step 4: Simplify right side
   8,986.16x = 62,092,084.03
5. Step 5: Solve for x
   x = 62,092,084.03/8,986.16
6. Step 6: Final answer
   x = 6,909.75