Finding the Third Proportional to 646,676 and 978,961

Step by Step Solution

1. Step 1: Write the proportion equation
   646,676 : 978,961 = 978,961 : x
2. Step 2: Convert to fraction form
   646,676/978,961 = 978,961/x
3. Step 3: Cross multiply
   646,676x = 978,961 × 978,961
4. Step 4: Simplify right side
   646,676x = 958,364,639,521
5. Step 5: Solve for x
   x = 958,364,639,521/646,676
6. Step 6: Final answer
   x = 1,481,985.79