Finding the Fourth Proportional to 9,960.61, 13,745.10 and 5,711.46

Step by Step Solution

1. Step 1: Write the proportion equation
   9,960.61 : 13,745.10 = 5,711.46 : x
2. Step 2: Convert to fraction form
   9,960.61/13,745.10 = 5,711.46/x
3. Step 3: Cross multiply
   9,960.61x = 13,745.10 × 5,711.46
4. Step 4: Simplify right side
   9,960.61x = 78,504,588.85
5. Step 5: Solve for x
   x = 78,504,588.85/9,960.61
6. Step 6: Final answer
   x = 7,881.50