Finding the Fourth Proportional to 2,891.09, 4,315.72 and 2,540.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,891.09 : 4,315.72 = 2,540.78 : x
2. Step 2: Convert to fraction form
   2,891.09/4,315.72 = 2,540.78/x
3. Step 3: Cross multiply
   2,891.09x = 4,315.72 × 2,540.78
4. Step 4: Simplify right side
   2,891.09x = 10,965,295.06
5. Step 5: Solve for x
   x = 10,965,295.06/2,891.09
6. Step 6: Final answer
   x = 3,792.79