Finding the Fourth Proportional to 9,414.56, 12,991.92 and 5,222.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,414.56 : 12,991.92 = 5,222.72 : x
2. Step 2: Convert to fraction form
   9,414.56/12,991.92 = 5,222.72/x
3. Step 3: Cross multiply
   9,414.56x = 12,991.92 × 5,222.72
4. Step 4: Simplify right side
   9,414.56x = 67,853,160.42
5. Step 5: Solve for x
   x = 67,853,160.42/9,414.56
6. Step 6: Final answer
   x = 7,207.26