Finding the Third Proportional to 319.17 and 667.30

Step by Step Solution

1. Step 1: Write the proportion equation
   319.17 : 667.30 = 667.30 : x
2. Step 2: Convert to fraction form
   319.17/667.30 = 667.30/x
3. Step 3: Cross multiply
   319.17x = 667.30 × 667.30
4. Step 4: Simplify right side
   319.17x = 445,290.33
5. Step 5: Solve for x
   x = 445,290.33/319.17
6. Step 6: Final answer
   x = 1,395.13