Finding the Fourth Proportional to 9,240.28, 12,721.98 and 7,477.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,240.28 : 12,721.98 = 7,477.72 : x
2. Step 2: Convert to fraction form
   9,240.28/12,721.98 = 7,477.72/x
3. Step 3: Cross multiply
   9,240.28x = 12,721.98 × 7,477.72
4. Step 4: Simplify right side
   9,240.28x = 95,131,404.29
5. Step 5: Solve for x
   x = 95,131,404.29/9,240.28
6. Step 6: Final answer
   x = 10,295.29