Finding the Third Proportional to 646,669 and 978,949

Step by Step Solution

1. Step 1: Write the proportion equation
   646,669 : 978,949 = 978,949 : x
2. Step 2: Convert to fraction form
   646,669/978,949 = 978,949/x
3. Step 3: Cross multiply
   646,669x = 978,949 × 978,949
4. Step 4: Simplify right side
   646,669x = 958,341,144,601
5. Step 5: Solve for x
   x = 958,341,144,601/646,669
6. Step 6: Final answer
   x = 1,481,965.49