Finding the Third Proportional to 646,518 and 978,775

Step by Step Solution

1. Step 1: Write the proportion equation
   646,518 : 978,775 = 978,775 : x
2. Step 2: Convert to fraction form
   646,518/978,775 = 978,775/x
3. Step 3: Cross multiply
   646,518x = 978,775 × 978,775
4. Step 4: Simplify right side
   646,518x = 958,000,500,625
5. Step 5: Solve for x
   x = 958,000,500,625/646,518
6. Step 6: Final answer
   x = 1,481,784.73