Finding the Third Proportional to 811,648 and 1,261,678

Step by Step Solution

1. Step 1: Write the proportion equation
   811,648 : 1,261,678 = 1,261,678 : x
2. Step 2: Convert to fraction form
   811,648/1,261,678 = 1,261,678/x
3. Step 3: Cross multiply
   811,648x = 1,261,678 × 1,261,678
4. Step 4: Simplify right side
   811,648x = 1,591,831,375,684
5. Step 5: Solve for x
   x = 1,591,831,375,684/811,648
6. Step 6: Final answer
   x = 1,961,233.66