Finding the Fourth Proportional to 2,578.98, 3,866.85 and 935.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.98 : 3,866.85 = 935.49 : x
2. Step 2: Convert to fraction form
   2,578.98/3,866.85 = 935.49/x
3. Step 3: Cross multiply
   2,578.98x = 3,866.85 × 935.49
4. Step 4: Simplify right side
   2,578.98x = 3,617,399.51
5. Step 5: Solve for x
   x = 3,617,399.51/2,578.98
6. Step 6: Final answer
   x = 1,402.65