Finding the Third Proportional to 639,834 and 1,382,274

Step by Step Solution

1. Step 1: Write the proportion equation
   639,834 : 1,382,274 = 1,382,274 : x
2. Step 2: Convert to fraction form
   639,834/1,382,274 = 1,382,274/x
3. Step 3: Cross multiply
   639,834x = 1,382,274 × 1,382,274
4. Step 4: Simplify right side
   639,834x = 1,910,681,411,076
5. Step 5: Solve for x
   x = 1,910,681,411,076/639,834
6. Step 6: Final answer
   x = 2,986,214.25