Finding the Third Proportional to 646,690 and 978,982

Step by Step Solution

1. Step 1: Write the proportion equation
   646,690 : 978,982 = 978,982 : x
2. Step 2: Convert to fraction form
   646,690/978,982 = 978,982/x
3. Step 3: Cross multiply
   646,690x = 978,982 × 978,982
4. Step 4: Simplify right side
   646,690x = 958,405,756,324
5. Step 5: Solve for x
   x = 958,405,756,324/646,690
6. Step 6: Final answer
   x = 1,482,017.28