Finding the Fourth Proportional to 2,560.15, 3,839.94 and 711.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,560.15 : 3,839.94 = 711.55 : x
2. Step 2: Convert to fraction form
   2,560.15/3,839.94 = 711.55/x
3. Step 3: Cross multiply
   2,560.15x = 3,839.94 × 711.55
4. Step 4: Simplify right side
   2,560.15x = 2,732,309.31
5. Step 5: Solve for x
   x = 2,732,309.31/2,560.15
6. Step 6: Final answer
   x = 1,067.25