Finding the Third Proportional to 290.34 and 443.20

Step by Step Solution

1. Step 1: Write the proportion equation
   290.34 : 443.20 = 443.20 : x
2. Step 2: Convert to fraction form
   290.34/443.20 = 443.20/x
3. Step 3: Cross multiply
   290.34x = 443.20 × 443.20
4. Step 4: Simplify right side
   290.34x = 196,429.01
5. Step 5: Solve for x
   x = 196,429.01/290.34
6. Step 6: Final answer
   x = 676.54