Finding the Fourth Proportional to 1,111.67, 1,534.22 and 831.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.67 : 1,534.22 = 831.42 : x
2. Step 2: Convert to fraction form
   1,111.67/1,534.22 = 831.42/x
3. Step 3: Cross multiply
   1,111.67x = 1,534.22 × 831.42
4. Step 4: Simplify right side
   1,111.67x = 1,275,581.19
5. Step 5: Solve for x
   x = 1,275,581.19/1,111.67
6. Step 6: Final answer
   x = 1,147.45