Finding the Fourth Proportional to 2,565.87, 3,540.89 and 1,386.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,565.87 : 3,540.89 = 1,386.94 : x
2. Step 2: Convert to fraction form
   2,565.87/3,540.89 = 1,386.94/x
3. Step 3: Cross multiply
   2,565.87x = 3,540.89 × 1,386.94
4. Step 4: Simplify right side
   2,565.87x = 4,910,984.27
5. Step 5: Solve for x
   x = 4,910,984.27/2,565.87
6. Step 6: Final answer
   x = 1,913.97