Finding the Fourth Proportional to 9,728.88, 13,417.56 and 8,223.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,728.88 : 13,417.56 = 8,223.72 : x
2. Step 2: Convert to fraction form
   9,728.88/13,417.56 = 8,223.72/x
3. Step 3: Cross multiply
   9,728.88x = 13,417.56 × 8,223.72
4. Step 4: Simplify right side
   9,728.88x = 110,342,256.52
5. Step 5: Solve for x
   x = 110,342,256.52/9,728.88
6. Step 6: Final answer
   x = 11,341.72