Finding the Third Proportional to 839,136 and 1,290,561

Step by Step Solution

1. Step 1: Write the proportion equation
   839,136 : 1,290,561 = 1,290,561 : x
2. Step 2: Convert to fraction form
   839,136/1,290,561 = 1,290,561/x
3. Step 3: Cross multiply
   839,136x = 1,290,561 × 1,290,561
4. Step 4: Simplify right side
   839,136x = 1,665,547,694,721
5. Step 5: Solve for x
   x = 1,665,547,694,721/839,136
6. Step 6: Final answer
   x = 1,984,836.42