Finding the Fourth Proportional to 9,418.56, 12,997.17 and 5,226.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,418.56 : 12,997.17 = 5,226.72 : x
2. Step 2: Convert to fraction form
   9,418.56/12,997.17 = 5,226.72/x
3. Step 3: Cross multiply
   9,418.56x = 12,997.17 × 5,226.72
4. Step 4: Simplify right side
   9,418.56x = 67,932,568.38
5. Step 5: Solve for x
   x = 67,932,568.38/9,418.56
6. Step 6: Final answer
   x = 7,212.63