Finding the Fourth Proportional to 9,726.72, 13,432.32 and 8,321.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,726.72 : 13,432.32 = 8,321.28 : x
2. Step 2: Convert to fraction form
   9,726.72/13,432.32 = 8,321.28/x
3. Step 3: Cross multiply
   9,726.72x = 13,432.32 × 8,321.28
4. Step 4: Simplify right side
   9,726.72x = 111,774,095.77
5. Step 5: Solve for x
   x = 111,774,095.77/9,726.72
6. Step 6: Final answer
   x = 11,491.45