Finding the Third Proportional to 839,142 and 1,290,569

Step by Step Solution

1. Step 1: Write the proportion equation
   839,142 : 1,290,569 = 1,290,569 : x
2. Step 2: Convert to fraction form
   839,142/1,290,569 = 1,290,569/x
3. Step 3: Cross multiply
   839,142x = 1,290,569 × 1,290,569
4. Step 4: Simplify right side
   839,142x = 1,665,568,343,761
5. Step 5: Solve for x
   x = 1,665,568,343,761/839,142
6. Step 6: Final answer
   x = 1,984,846.84