Finding the Third Proportional to 441.25 and 685.25

Step by Step Solution

1. Step 1: Write the proportion equation
   441.25 : 685.25 = 685.25 : x
2. Step 2: Convert to fraction form
   441.25/685.25 = 685.25/x
3. Step 3: Cross multiply
   441.25x = 685.25 × 685.25
4. Step 4: Simplify right side
   441.25x = 469,567.56
5. Step 5: Solve for x
   x = 469,567.56/441.25
6. Step 6: Final answer
   x = 1,064.18