Finding the Fourth Proportional to 1,111.90, 1,532.71 and 831.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.90 : 1,532.71 = 831.71 : x
2. Step 2: Convert to fraction form
   1,111.90/1,532.71 = 831.71/x
3. Step 3: Cross multiply
   1,111.90x = 1,532.71 × 831.71
4. Step 4: Simplify right side
   1,111.90x = 1,274,770.23
5. Step 5: Solve for x
   x = 1,274,770.23/1,111.90
6. Step 6: Final answer
   x = 1,146.48