Finding the Third Proportional to 622,912 and 978,638

Step by Step Solution

1. Step 1: Write the proportion equation
   622,912 : 978,638 = 978,638 : x
2. Step 2: Convert to fraction form
   622,912/978,638 = 978,638/x
3. Step 3: Cross multiply
   622,912x = 978,638 × 978,638
4. Step 4: Simplify right side
   622,912x = 957,732,335,044
5. Step 5: Solve for x
   x = 957,732,335,044/622,912
6. Step 6: Final answer
   x = 1,537,508.24