Finding the Third Proportional to 490.50 and 635.63

Step by Step Solution

1. Step 1: Write the proportion equation
   490.50 : 635.63 = 635.63 : x
2. Step 2: Convert to fraction form
   490.50/635.63 = 635.63/x
3. Step 3: Cross multiply
   490.50x = 635.63 × 635.63
4. Step 4: Simplify right side
   490.50x = 404,019.14
5. Step 5: Solve for x
   x = 404,019.14/490.50
6. Step 6: Final answer
   x = 823.69