Finding the Third Proportional to 811,660 and 1,261,698

Step by Step Solution

1. Step 1: Write the proportion equation
   811,660 : 1,261,698 = 1,261,698 : x
2. Step 2: Convert to fraction form
   811,660/1,261,698 = 1,261,698/x
3. Step 3: Cross multiply
   811,660x = 1,261,698 × 1,261,698
4. Step 4: Simplify right side
   811,660x = 1,591,881,843,204
5. Step 5: Solve for x
   x = 1,591,881,843,204/811,660
6. Step 6: Final answer
   x = 1,961,266.84