Finding the Fourth Proportional to 9,960.10, 13,745.73 and 5,711.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,960.10 : 13,745.73 = 5,711.55 : x
2. Step 2: Convert to fraction form
   9,960.10/13,745.73 = 5,711.55/x
3. Step 3: Cross multiply
   9,960.10x = 13,745.73 × 5,711.55
4. Step 4: Simplify right side
   9,960.10x = 78,509,404.10
5. Step 5: Solve for x
   x = 78,509,404.10/9,960.10
6. Step 6: Final answer
   x = 7,882.40