Finding the Third Proportional to 449.50 and 628.50

Step by Step Solution

1. Step 1: Write the proportion equation
   449.50 : 628.50 = 628.50 : x
2. Step 2: Convert to fraction form
   449.50/628.50 = 628.50/x
3. Step 3: Cross multiply
   449.50x = 628.50 × 628.50
4. Step 4: Simplify right side
   449.50x = 395,012.25
5. Step 5: Solve for x
   x = 395,012.25/449.50
6. Step 6: Final answer
   x = 878.78