Finding the Fourth Proportional to 8,578.90, 12,870.78 and 2,735.96

Step by Step Solution

1. Step 1: Write the proportion equation
   8,578.90 : 12,870.78 = 2,735.96 : x
2. Step 2: Convert to fraction form
   8,578.90/12,870.78 = 2,735.96/x
3. Step 3: Cross multiply
   8,578.90x = 12,870.78 × 2,735.96
4. Step 4: Simplify right side
   8,578.90x = 35,213,939.25
5. Step 5: Solve for x
   x = 35,213,939.25/8,578.90
6. Step 6: Final answer
   x = 4,104.71