Finding the Fourth Proportional to 15,443.48, 21,311.18 and 8,728.71

Step by Step Solution

1. Step 1: Write the proportion equation
   15,443.48 : 21,311.18 = 8,728.71 : x
2. Step 2: Convert to fraction form
   15,443.48/21,311.18 = 8,728.71/x
3. Step 3: Cross multiply
   15,443.48x = 21,311.18 × 8,728.71
4. Step 4: Simplify right side
   15,443.48x = 186,019,013.33
5. Step 5: Solve for x
   x = 186,019,013.33/15,443.48
6. Step 6: Final answer
   x = 12,045.15