Finding the Fourth Proportional to 15,443.92, 21,315.72 and 9,155.08

Step by Step Solution

1. Step 1: Write the proportion equation
   15,443.92 : 21,315.72 = 9,155.08 : x
2. Step 2: Convert to fraction form
   15,443.92/21,315.72 = 9,155.08/x
3. Step 3: Cross multiply
   15,443.92x = 21,315.72 × 9,155.08
4. Step 4: Simplify right side
   15,443.92x = 195,147,121.86
5. Step 5: Solve for x
   x = 195,147,121.86/15,443.92
6. Step 6: Final answer
   x = 12,635.85