Finding the Fourth Proportional to 8,339.28, 12,507.48 and 3,144.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,339.28 : 12,507.48 = 3,144.72 : x
2. Step 2: Convert to fraction form
   8,339.28/12,507.48 = 3,144.72/x
3. Step 3: Cross multiply
   8,339.28x = 12,507.48 × 3,144.72
4. Step 4: Simplify right side
   8,339.28x = 39,332,522.51
5. Step 5: Solve for x
   x = 39,332,522.51/8,339.28
6. Step 6: Final answer
   x = 4,716.54