Finding the Fourth Proportional to 2,563.12, 3,845.16 and 831.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,563.12 : 3,845.16 = 831.28 : x
2. Step 2: Convert to fraction form
   2,563.12/3,845.16 = 831.28/x
3. Step 3: Cross multiply
   2,563.12x = 3,845.16 × 831.28
4. Step 4: Simplify right side
   2,563.12x = 3,196,404.60
5. Step 5: Solve for x
   x = 3,196,404.60/2,563.12
6. Step 6: Final answer
   x = 1,247.08