Finding the Third Proportional to 811,638 and 1,261,666

Step by Step Solution

1. Step 1: Write the proportion equation
   811,638 : 1,261,666 = 1,261,666 : x
2. Step 2: Convert to fraction form
   811,638/1,261,666 = 1,261,666/x
3. Step 3: Cross multiply
   811,638x = 1,261,666 × 1,261,666
4. Step 4: Simplify right side
   811,638x = 1,591,801,095,556
5. Step 5: Solve for x
   x = 1,591,801,095,556/811,638
6. Step 6: Final answer
   x = 1,961,220.51