Finding the Fourth Proportional to 9,391.72, 12,960.90 and 5,200.36

Step by Step Solution

1. Step 1: Write the proportion equation
   9,391.72 : 12,960.90 = 5,200.36 : x
2. Step 2: Convert to fraction form
   9,391.72/12,960.90 = 5,200.36/x
3. Step 3: Cross multiply
   9,391.72x = 12,960.90 × 5,200.36
4. Step 4: Simplify right side
   9,391.72x = 67,401,345.92
5. Step 5: Solve for x
   x = 67,401,345.92/9,391.72
6. Step 6: Final answer
   x = 7,176.68