Finding the Third Proportional to 839.75 and 1,105

Step by Step Solution

1. Step 1: Write the proportion equation
   839.75 : 1,105 = 1,105 : x
2. Step 2: Convert to fraction form
   839.75/1,105 = 1,105/x
3. Step 3: Cross multiply
   839.75x = 1,105 × 1,105
4. Step 4: Simplify right side
   839.75x = 1,221,025
5. Step 5: Solve for x
   x = 1,221,025/839.75
6. Step 6: Final answer
   x = 1,454.03