Finding the Fourth Proportional to 9,959.86, 13,745.40 and 5,711.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,959.86 : 13,745.40 = 5,711.31 : x
2. Step 2: Convert to fraction form
   9,959.86/13,745.40 = 5,711.31/x
3. Step 3: Cross multiply
   9,959.86x = 13,745.40 × 5,711.31
4. Step 4: Simplify right side
   9,959.86x = 78,504,240.47
5. Step 5: Solve for x
   x = 78,504,240.47/9,959.86
6. Step 6: Final answer
   x = 7,882.06