Finding the Fourth Proportional to 1,111.43, 1,533.67 and 831.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.43 : 1,533.67 = 831.38 : x
2. Step 2: Convert to fraction form
   1,111.43/1,533.67 = 831.38/x
3. Step 3: Cross multiply
   1,111.43x = 1,533.67 × 831.38
4. Step 4: Simplify right side
   1,111.43x = 1,275,052.82
5. Step 5: Solve for x
   x = 1,275,052.82/1,111.43
6. Step 6: Final answer
   x = 1,147.22