Finding the Fourth Proportional to 9,391.34, 12,960.06 and 5,199.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,391.34 : 12,960.06 = 5,199.50 : x
2. Step 2: Convert to fraction form
   9,391.34/12,960.06 = 5,199.50/x
3. Step 3: Cross multiply
   9,391.34x = 12,960.06 × 5,199.50
4. Step 4: Simplify right side
   9,391.34x = 67,385,831.97
5. Step 5: Solve for x
   x = 67,385,831.97/9,391.34
6. Step 6: Final answer
   x = 7,175.32