Finding the Third Proportional to 389,756 and 839,672

Step by Step Solution

1. Step 1: Write the proportion equation
   389,756 : 839,672 = 839,672 : x
2. Step 2: Convert to fraction form
   389,756/839,672 = 839,672/x
3. Step 3: Cross multiply
   389,756x = 839,672 × 839,672
4. Step 4: Simplify right side
   389,756x = 705,049,067,584
5. Step 5: Solve for x
   x = 705,049,067,584/389,756
6. Step 6: Final answer
   x = 1,808,949.88