Finding the Fourth Proportional to 9,414.72, 12,992.72 and 5,223.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,414.72 : 12,992.72 = 5,223.78 : x
2. Step 2: Convert to fraction form
   9,414.72/12,992.72 = 5,223.78/x
3. Step 3: Cross multiply
   9,414.72x = 12,992.72 × 5,223.78
4. Step 4: Simplify right side
   9,414.72x = 67,871,084.76
5. Step 5: Solve for x
   x = 67,871,084.76/9,414.72
6. Step 6: Final answer
   x = 7,209.04