Finding the Fourth Proportional to 2,578.89, 3,869.86 and 2,369.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.89 : 3,869.86 = 2,369.71 : x
2. Step 2: Convert to fraction form
   2,578.89/3,869.86 = 2,369.71/x
3. Step 3: Cross multiply
   2,578.89x = 3,869.86 × 2,369.71
4. Step 4: Simplify right side
   2,578.89x = 9,170,445.94
5. Step 5: Solve for x
   x = 9,170,445.94/2,578.89
6. Step 6: Final answer
   x = 3,555.97