Finding the Fourth Proportional to 10,761.88, 16,128.24 and 5,571.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,761.88 : 16,128.24 = 5,571.40 : x
2. Step 2: Convert to fraction form
   10,761.88/16,128.24 = 5,571.40/x
3. Step 3: Cross multiply
   10,761.88x = 16,128.24 × 5,571.40
4. Step 4: Simplify right side
   10,761.88x = 89,856,876.34
5. Step 5: Solve for x
   x = 89,856,876.34/10,761.88
6. Step 6: Final answer
   x = 8,349.55