Finding the Fourth Proportional to 12,727.12, 17,565.78 and 7,949.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,727.12 : 17,565.78 = 7,949.20 : x
2. Step 2: Convert to fraction form
   12,727.12/17,565.78 = 7,949.20/x
3. Step 3: Cross multiply
   12,727.12x = 17,565.78 × 7,949.20
4. Step 4: Simplify right side
   12,727.12x = 139,633,898.38
5. Step 5: Solve for x
   x = 139,633,898.38/12,727.12
6. Step 6: Final answer
   x = 10,971.37