Finding the Third Proportional to 217.31 and 443.91

Step by Step Solution

1. Step 1: Write the proportion equation
   217.31 : 443.91 = 443.91 : x
2. Step 2: Convert to fraction form
   217.31/443.91 = 443.91/x
3. Step 3: Cross multiply
   217.31x = 443.91 × 443.91
4. Step 4: Simplify right side
   217.31x = 197,052.76
5. Step 5: Solve for x
   x = 197,052.76/217.31
6. Step 6: Final answer
   x = 906.77