Finding the Third Proportional to 641,404 and 1,384,503

Step by Step Solution

1. Step 1: Write the proportion equation
   641,404 : 1,384,503 = 1,384,503 : x
2. Step 2: Convert to fraction form
   641,404/1,384,503 = 1,384,503/x
3. Step 3: Cross multiply
   641,404x = 1,384,503 × 1,384,503
4. Step 4: Simplify right side
   641,404x = 1,916,848,557,009
5. Step 5: Solve for x
   x = 1,916,848,557,009/641,404
6. Step 6: Final answer
   x = 2,988,519.81