Finding the Fourth Proportional to 2,578.69, 3,870.08 and 935.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.69 : 3,870.08 = 935.70 : x
2. Step 2: Convert to fraction form
   2,578.69/3,870.08 = 935.70/x
3. Step 3: Cross multiply
   2,578.69x = 3,870.08 × 935.70
4. Step 4: Simplify right side
   2,578.69x = 3,621,233.86
5. Step 5: Solve for x
   x = 3,621,233.86/2,578.69
6. Step 6: Final answer
   x = 1,404.29