Finding the Third Proportional to 621,809 and 1,359,610

Step by Step Solution

1. Step 1: Write the proportion equation
   621,809 : 1,359,610 = 1,359,610 : x
2. Step 2: Convert to fraction form
   621,809/1,359,610 = 1,359,610/x
3. Step 3: Cross multiply
   621,809x = 1,359,610 × 1,359,610
4. Step 4: Simplify right side
   621,809x = 1,848,539,352,100
5. Step 5: Solve for x
   x = 1,848,539,352,100/621,809
6. Step 6: Final answer
   x = 2,972,841.10