Finding the Third Proportional to 641,936 and 1,390,912

Step by Step Solution

1. Step 1: Write the proportion equation
   641,936 : 1,390,912 = 1,390,912 : x
2. Step 2: Convert to fraction form
   641,936/1,390,912 = 1,390,912/x
3. Step 3: Cross multiply
   641,936x = 1,390,912 × 1,390,912
4. Step 4: Simplify right side
   641,936x = 1,934,636,191,744
5. Step 5: Solve for x
   x = 1,934,636,191,744/641,936
6. Step 6: Final answer
   x = 3,013,752.45