Finding the Third Proportional to 401.25 and 622.88

Step by Step Solution

1. Step 1: Write the proportion equation
   401.25 : 622.88 = 622.88 : x
2. Step 2: Convert to fraction form
   401.25/622.88 = 622.88/x
3. Step 3: Cross multiply
   401.25x = 622.88 × 622.88
4. Step 4: Simplify right side
   401.25x = 387,973.27
5. Step 5: Solve for x
   x = 387,973.27/401.25
6. Step 6: Final answer
   x = 966.91