Finding the Fourth Proportional to 8,578.88, 12,869.76 and 4,196.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,578.88 : 12,869.76 = 4,196.72 : x
2. Step 2: Convert to fraction form
   8,578.88/12,869.76 = 4,196.72/x
3. Step 3: Cross multiply
   8,578.88x = 12,869.76 × 4,196.72
4. Step 4: Simplify right side
   8,578.88x = 54,010,779.19
5. Step 5: Solve for x
   x = 54,010,779.19/8,578.88
6. Step 6: Final answer
   x = 6,295.78