Finding the Third Proportional to 646,668 and 978,945

Step by Step Solution

1. Step 1: Write the proportion equation
   646,668 : 978,945 = 978,945 : x
2. Step 2: Convert to fraction form
   646,668/978,945 = 978,945/x
3. Step 3: Cross multiply
   646,668x = 978,945 × 978,945
4. Step 4: Simplify right side
   646,668x = 958,333,313,025
5. Step 5: Solve for x
   x = 958,333,313,025/646,668
6. Step 6: Final answer
   x = 1,481,955.68