Finding the Fourth Proportional to 8,418.72, 12,629.52 and 4,260.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,418.72 : 12,629.52 = 4,260.72 : x
2. Step 2: Convert to fraction form
   8,418.72/12,629.52 = 4,260.72/x
3. Step 3: Cross multiply
   8,418.72x = 12,629.52 × 4,260.72
4. Step 4: Simplify right side
   8,418.72x = 53,810,848.45
5. Step 5: Solve for x
   x = 53,810,848.45/8,418.72
6. Step 6: Final answer
   x = 6,391.81