Finding the Third Proportional to 622,940 and 978,680

Step by Step Solution

1. Step 1: Write the proportion equation
   622,940 : 978,680 = 978,680 : x
2. Step 2: Convert to fraction form
   622,940/978,680 = 978,680/x
3. Step 3: Cross multiply
   622,940x = 978,680 × 978,680
4. Step 4: Simplify right side
   622,940x = 957,814,542,400
5. Step 5: Solve for x
   x = 957,814,542,400/622,940
6. Step 6: Final answer
   x = 1,537,571.10