Finding the Fourth Proportional to 3,640.56, 5,017.98 and 2,578.68

Step by Step Solution

1. Step 1: Write the proportion equation
   3,640.56 : 5,017.98 = 2,578.68 : x
2. Step 2: Convert to fraction form
   3,640.56/5,017.98 = 2,578.68/x
3. Step 3: Cross multiply
   3,640.56x = 5,017.98 × 2,578.68
4. Step 4: Simplify right side
   3,640.56x = 12,939,764.67
5. Step 5: Solve for x
   x = 12,939,764.67/3,640.56
6. Step 6: Final answer
   x = 3,554.33