Finding the Fourth Proportional to 1,359.69, 2,036.48 and 831.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.69 : 2,036.48 = 831.15 : x
2. Step 2: Convert to fraction form
   1,359.69/2,036.48 = 831.15/x
3. Step 3: Cross multiply
   1,359.69x = 2,036.48 × 831.15
4. Step 4: Simplify right side
   1,359.69x = 1,692,616.20
5. Step 5: Solve for x
   x = 1,692,616.20/1,359.69
6. Step 6: Final answer
   x = 1,244.85