Finding the Third Proportional to 443.39 and 665.30

Step by Step Solution

1. Step 1: Write the proportion equation
   443.39 : 665.30 = 665.30 : x
2. Step 2: Convert to fraction form
   443.39/665.30 = 665.30/x
3. Step 3: Cross multiply
   443.39x = 665.30 × 665.30
4. Step 4: Simplify right side
   443.39x = 442,619.93
5. Step 5: Solve for x
   x = 442,619.93/443.39
6. Step 6: Final answer
   x = 998.26