Finding the Fourth Proportional to 1,380.97, 2,068.27 and 831.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.97 : 2,068.27 = 831.94 : x
2. Step 2: Convert to fraction form
   1,380.97/2,068.27 = 831.94/x
3. Step 3: Cross multiply
   1,380.97x = 2,068.27 × 831.94
4. Step 4: Simplify right side
   1,380.97x = 1,720,680.93
5. Step 5: Solve for x
   x = 1,720,680.93/1,380.97
6. Step 6: Final answer
   x = 1,245.99