Finding the Fourth Proportional to 8,399.52, 12,597.60 and 7,983.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,399.52 : 12,597.60 = 7,983.20 : x
2. Step 2: Convert to fraction form
   8,399.52/12,597.60 = 7,983.20/x
3. Step 3: Cross multiply
   8,399.52x = 12,597.60 × 7,983.20
4. Step 4: Simplify right side
   8,399.52x = 100,569,160.32
5. Step 5: Solve for x
   x = 100,569,160.32/8,399.52
6. Step 6: Final answer
   x = 11,973.20