Finding the Third Proportional to 408,795 and 638,021.25

Step by Step Solution

1. Step 1: Write the proportion equation
   408,795 : 638,021.25 = 638,021.25 : x
2. Step 2: Convert to fraction form
   408,795/638,021.25 = 638,021.25/x
3. Step 3: Cross multiply
   408,795x = 638,021.25 × 638,021.25
4. Step 4: Simplify right side
   408,795x = 407,071,115,451.56
5. Step 5: Solve for x
   x = 407,071,115,451.56/408,795
6. Step 6: Final answer
   x = 995,783.01