Finding the Fourth Proportional to 1,420.76, 1,960.82 and 831.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.76 : 1,960.82 = 831.29 : x
2. Step 2: Convert to fraction form
   1,420.76/1,960.82 = 831.29/x
3. Step 3: Cross multiply
   1,420.76x = 1,960.82 × 831.29
4. Step 4: Simplify right side
   1,420.76x = 1,629,996.10
5. Step 5: Solve for x
   x = 1,629,996.10/1,420.76
6. Step 6: Final answer
   x = 1,147.27