Finding the Fourth Proportional to 2,064.23, 3,096.31 and 831.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,064.23 : 3,096.31 = 831.61 : x
2. Step 2: Convert to fraction form
   2,064.23/3,096.31 = 831.61/x
3. Step 3: Cross multiply
   2,064.23x = 3,096.31 × 831.61
4. Step 4: Simplify right side
   2,064.23x = 2,574,923.40
5. Step 5: Solve for x
   x = 2,574,923.40/2,064.23
6. Step 6: Final answer
   x = 1,247.40