Finding the Fourth Proportional to 9,418.72, 12,997.92 and 5,227.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,418.72 : 12,997.92 = 5,227.12 : x
2. Step 2: Convert to fraction form
   9,418.72/12,997.92 = 5,227.12/x
3. Step 3: Cross multiply
   9,418.72x = 12,997.92 × 5,227.12
4. Step 4: Simplify right side
   9,418.72x = 67,941,687.59
5. Step 5: Solve for x
   x = 67,941,687.59/9,418.72
6. Step 6: Final answer
   x = 7,213.47