Finding the Fourth Proportional to 8,499.56, 12,687.20 and 7,874.24

Step by Step Solution

1. Step 1: Write the proportion equation
   8,499.56 : 12,687.20 = 7,874.24 : x
2. Step 2: Convert to fraction form
   8,499.56/12,687.20 = 7,874.24/x
3. Step 3: Cross multiply
   8,499.56x = 12,687.20 × 7,874.24
4. Step 4: Simplify right side
   8,499.56x = 99,902,057.73
5. Step 5: Solve for x
   x = 99,902,057.73/8,499.56
6. Step 6: Final answer
   x = 11,753.79