Finding the Third Proportional to 609,618 and 905,616

Step by Step Solution

1. Step 1: Write the proportion equation
   609,618 : 905,616 = 905,616 : x
2. Step 2: Convert to fraction form
   609,618/905,616 = 905,616/x
3. Step 3: Cross multiply
   609,618x = 905,616 × 905,616
4. Step 4: Simplify right side
   609,618x = 820,140,339,456
5. Step 5: Solve for x
   x = 820,140,339,456/609,618
6. Step 6: Final answer
   x = 1,345,334.85