Finding the Third Proportional to 408,786.75 and 638,010

Step by Step Solution

1. Step 1: Write the proportion equation
   408,786.75 : 638,010 = 638,010 : x
2. Step 2: Convert to fraction form
   408,786.75/638,010 = 638,010/x
3. Step 3: Cross multiply
   408,786.75x = 638,010 × 638,010
4. Step 4: Simplify right side
   408,786.75x = 407,056,760,100
5. Step 5: Solve for x
   x = 407,056,760,100/408,786.75
6. Step 6: Final answer
   x = 995,767.99