Finding the Third Proportional to 622,939 and 978,678

Step by Step Solution

1. Step 1: Write the proportion equation
   622,939 : 978,678 = 978,678 : x
2. Step 2: Convert to fraction form
   622,939/978,678 = 978,678/x
3. Step 3: Cross multiply
   622,939x = 978,678 × 978,678
4. Step 4: Simplify right side
   622,939x = 957,810,627,684
5. Step 5: Solve for x
   x = 957,810,627,684/622,939
6. Step 6: Final answer
   x = 1,537,567.29