Finding the Fourth Proportional to 1,379.16, 2,065.98 and 831.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.16 : 2,065.98 = 831.04 : x
2. Step 2: Convert to fraction form
   1,379.16/2,065.98 = 831.04/x
3. Step 3: Cross multiply
   1,379.16x = 2,065.98 × 831.04
4. Step 4: Simplify right side
   1,379.16x = 1,716,912.02
5. Step 5: Solve for x
   x = 1,716,912.02/1,379.16
6. Step 6: Final answer
   x = 1,244.90