Finding the Third Proportional to 636,189 and 1,386,689

Step by Step Solution

1. Step 1: Write the proportion equation
   636,189 : 1,386,689 = 1,386,689 : x
2. Step 2: Convert to fraction form
   636,189/1,386,689 = 1,386,689/x
3. Step 3: Cross multiply
   636,189x = 1,386,689 × 1,386,689
4. Step 4: Simplify right side
   636,189x = 1,922,906,382,721
5. Step 5: Solve for x
   x = 1,922,906,382,721/636,189
6. Step 6: Final answer
   x = 3,022,539.50