Finding the Fourth Proportional to 8,641.24, 12,965.52 and 4,258.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,641.24 : 12,965.52 = 4,258.72 : x
2. Step 2: Convert to fraction form
   8,641.24/12,965.52 = 4,258.72/x
3. Step 3: Cross multiply
   8,641.24x = 12,965.52 × 4,258.72
4. Step 4: Simplify right side
   8,641.24x = 55,216,519.33
5. Step 5: Solve for x
   x = 55,216,519.33/8,641.24
6. Step 6: Final answer
   x = 6,389.88