Finding the Fourth Proportional to 11,617.20, 17,418.24 and 6,426.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,617.20 : 17,418.24 = 6,426.72 : x
2. Step 2: Convert to fraction form
   11,617.20/17,418.24 = 6,426.72/x
3. Step 3: Cross multiply
   11,617.20x = 17,418.24 × 6,426.72
4. Step 4: Simplify right side
   11,617.20x = 111,942,151.37
5. Step 5: Solve for x
   x = 111,942,151.37/11,617.20
6. Step 6: Final answer
   x = 9,635.90