Finding the Fourth Proportional to 2,578.81, 3,868.73 and 935.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.81 : 3,868.73 = 935.42 : x
2. Step 2: Convert to fraction form
   2,578.81/3,868.73 = 935.42/x
3. Step 3: Cross multiply
   2,578.81x = 3,868.73 × 935.42
4. Step 4: Simplify right side
   2,578.81x = 3,618,887.42
5. Step 5: Solve for x
   x = 3,618,887.42/2,578.81
6. Step 6: Final answer
   x = 1,403.32