Finding the Fourth Proportional to 2,578.48, 3,866.46 and 934.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.48 : 3,866.46 = 934.78 : x
2. Step 2: Convert to fraction form
   2,578.48/3,866.46 = 934.78/x
3. Step 3: Cross multiply
   2,578.48x = 3,866.46 × 934.78
4. Step 4: Simplify right side
   2,578.48x = 3,614,289.48
5. Step 5: Solve for x
   x = 3,614,289.48/2,578.48
6. Step 6: Final answer
   x = 1,401.71