Finding the Third Proportional to 839,144 and 1,290,572

Step by Step Solution

1. Step 1: Write the proportion equation
   839,144 : 1,290,572 = 1,290,572 : x
2. Step 2: Convert to fraction form
   839,144/1,290,572 = 1,290,572/x
3. Step 3: Cross multiply
   839,144x = 1,290,572 × 1,290,572
4. Step 4: Simplify right side
   839,144x = 1,665,576,087,184
5. Step 5: Solve for x
   x = 1,665,576,087,184/839,144
6. Step 6: Final answer
   x = 1,984,851.33