Finding the Third Proportional to 389,648 and 839,488

Step by Step Solution

1. Step 1: Write the proportion equation
   389,648 : 839,488 = 839,488 : x
2. Step 2: Convert to fraction form
   389,648/839,488 = 839,488/x
3. Step 3: Cross multiply
   389,648x = 839,488 × 839,488
4. Step 4: Simplify right side
   389,648x = 704,740,102,144
5. Step 5: Solve for x
   x = 704,740,102,144/389,648
6. Step 6: Final answer
   x = 1,808,658.33