Finding the Fourth Proportional to 8,448.72, 12,680.72 and 4,291.60

Step by Step Solution

1. Step 1: Write the proportion equation
   8,448.72 : 12,680.72 = 4,291.60 : x
2. Step 2: Convert to fraction form
   8,448.72/12,680.72 = 4,291.60/x
3. Step 3: Cross multiply
   8,448.72x = 12,680.72 × 4,291.60
4. Step 4: Simplify right side
   8,448.72x = 54,420,577.95
5. Step 5: Solve for x
   x = 54,420,577.95/8,448.72
6. Step 6: Final answer
   x = 6,441.28