Finding the Fourth Proportional to 9,724.15, 13,391.49 and 9,257.59

Step by Step Solution

1. Step 1: Write the proportion equation
   9,724.15 : 13,391.49 = 9,257.59 : x
2. Step 2: Convert to fraction form
   9,724.15/13,391.49 = 9,257.59/x
3. Step 3: Cross multiply
   9,724.15x = 13,391.49 × 9,257.59
4. Step 4: Simplify right side
   9,724.15x = 123,972,923.91
5. Step 5: Solve for x
   x = 123,972,923.91/9,724.15
6. Step 6: Final answer
   x = 12,748.97