Finding the Third Proportional to 386,628 and 839,676

Step by Step Solution

1. Step 1: Write the proportion equation
   386,628 : 839,676 = 839,676 : x
2. Step 2: Convert to fraction form
   386,628/839,676 = 839,676/x
3. Step 3: Cross multiply
   386,628x = 839,676 × 839,676
4. Step 4: Simplify right side
   386,628x = 705,055,784,976
5. Step 5: Solve for x
   x = 705,055,784,976/386,628
6. Step 6: Final answer
   x = 1,823,602.49