Finding the Third Proportional to 222,766 and 489,638

Step by Step Solution

1. Step 1: Write the proportion equation
   222,766 : 489,638 = 489,638 : x
2. Step 2: Convert to fraction form
   222,766/489,638 = 489,638/x
3. Step 3: Cross multiply
   222,766x = 489,638 × 489,638
4. Step 4: Simplify right side
   222,766x = 239,745,371,044
5. Step 5: Solve for x
   x = 239,745,371,044/222,766
6. Step 6: Final answer
   x = 1,076,220.66