Finding the Fourth Proportional to 8,359.20, 12,441.60 and 8,359.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,359.20 : 12,441.60 = 8,359.20 : x
2. Step 2: Convert to fraction form
   8,359.20/12,441.60 = 8,359.20/x
3. Step 3: Cross multiply
   8,359.20x = 12,441.60 × 8,359.20
4. Step 4: Simplify right side
   8,359.20x = 104,001,822.72
5. Step 5: Solve for x
   x = 104,001,822.72/8,359.20
6. Step 6: Final answer
   x = 12,441.60