Finding the Third Proportional to 646,679 and 978,964

Step by Step Solution

1. Step 1: Write the proportion equation
   646,679 : 978,964 = 978,964 : x
2. Step 2: Convert to fraction form
   646,679/978,964 = 978,964/x
3. Step 3: Cross multiply
   646,679x = 978,964 × 978,964
4. Step 4: Simplify right side
   646,679x = 958,370,513,296
5. Step 5: Solve for x
   x = 958,370,513,296/646,679
6. Step 6: Final answer
   x = 1,481,987.99