Finding the Fourth Proportional to 12,948.72, 17,863.92 and 8,231.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,948.72 : 17,863.92 = 8,231.28 : x
2. Step 2: Convert to fraction form
   12,948.72/17,863.92 = 8,231.28/x
3. Step 3: Cross multiply
   12,948.72x = 17,863.92 × 8,231.28
4. Step 4: Simplify right side
   12,948.72x = 147,042,927.42
5. Step 5: Solve for x
   x = 147,042,927.42/12,948.72
6. Step 6: Final answer
   x = 11,355.79