Finding the Fourth Proportional to 8,861.40, 12,234.42 and 5,507.80

Step by Step Solution

1. Step 1: Write the proportion equation
   8,861.40 : 12,234.42 = 5,507.80 : x
2. Step 2: Convert to fraction form
   8,861.40/12,234.42 = 5,507.80/x
3. Step 3: Cross multiply
   8,861.40x = 12,234.42 × 5,507.80
4. Step 4: Simplify right side
   8,861.40x = 67,384,738.48
5. Step 5: Solve for x
   x = 67,384,738.48/8,861.40
6. Step 6: Final answer
   x = 7,604.30