Finding the Fourth Proportional to 8,440.72, 12,663.81 and 4,057.61

Step by Step Solution

1. Step 1: Write the proportion equation
   8,440.72 : 12,663.81 = 4,057.61 : x
2. Step 2: Convert to fraction form
   8,440.72/12,663.81 = 4,057.61/x
3. Step 3: Cross multiply
   8,440.72x = 12,663.81 × 4,057.61
4. Step 4: Simplify right side
   8,440.72x = 51,384,738.78
5. Step 5: Solve for x
   x = 51,384,738.78/8,440.72
6. Step 6: Final answer
   x = 6,087.72