Finding the Third Proportional to 404.50 and 619.75

Step by Step Solution

1. Step 1: Write the proportion equation
   404.50 : 619.75 = 619.75 : x
2. Step 2: Convert to fraction form
   404.50/619.75 = 619.75/x
3. Step 3: Cross multiply
   404.50x = 619.75 × 619.75
4. Step 4: Simplify right side
   404.50x = 384,090.06
5. Step 5: Solve for x
   x = 384,090.06/404.50
6. Step 6: Final answer
   x = 949.54