Finding the Fourth Proportional to 8,610.20, 12,080.20 and 8,610.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,610.20 : 12,080.20 = 8,610.20 : x
2. Step 2: Convert to fraction form
   8,610.20/12,080.20 = 8,610.20/x
3. Step 3: Cross multiply
   8,610.20x = 12,080.20 × 8,610.20
4. Step 4: Simplify right side
   8,610.20x = 104,012,938.04
5. Step 5: Solve for x
   x = 104,012,938.04/8,610.20
6. Step 6: Final answer
   x = 12,080.20