Finding the Third Proportional to 404.91 and 662.81

Step by Step Solution

1. Step 1: Write the proportion equation
   404.91 : 662.81 = 662.81 : x
2. Step 2: Convert to fraction form
   404.91/662.81 = 662.81/x
3. Step 3: Cross multiply
   404.91x = 662.81 × 662.81
4. Step 4: Simplify right side
   404.91x = 439,320.41
5. Step 5: Solve for x
   x = 439,320.41/404.91
6. Step 6: Final answer
   x = 1,084.99