Finding the Fourth Proportional to 1,356.52, 1,869.94 and 831.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.52 : 1,869.94 = 831.64 : x
2. Step 2: Convert to fraction form
   1,356.52/1,869.94 = 831.64/x
3. Step 3: Cross multiply
   1,356.52x = 1,869.94 × 831.64
4. Step 4: Simplify right side
   1,356.52x = 1,555,116.90
5. Step 5: Solve for x
   x = 1,555,116.90/1,356.52
6. Step 6: Final answer
   x = 1,146.40