Finding the Fourth Proportional to 2,578.43, 3,868.41 and 1,018.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.43 : 3,868.41 = 1,018.65 : x
2. Step 2: Convert to fraction form
   2,578.43/3,868.41 = 1,018.65/x
3. Step 3: Cross multiply
   2,578.43x = 3,868.41 × 1,018.65
4. Step 4: Simplify right side
   2,578.43x = 3,940,555.85
5. Step 5: Solve for x
   x = 3,940,555.85/2,578.43
6. Step 6: Final answer
   x = 1,528.28