Finding the Fourth Proportional to 2,839.94, 4,259.95 and 865.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,839.94 : 4,259.95 = 865.61 : x
2. Step 2: Convert to fraction form
   2,839.94/4,259.95 = 865.61/x
3. Step 3: Cross multiply
   2,839.94x = 4,259.95 × 865.61
4. Step 4: Simplify right side
   2,839.94x = 3,687,431.86
5. Step 5: Solve for x
   x = 3,687,431.86/2,839.94
6. Step 6: Final answer
   x = 1,298.42