Finding the Third Proportional to 641,880 and 1,392,624

Step by Step Solution

1. Step 1: Write the proportion equation
   641,880 : 1,392,624 = 1,392,624 : x
2. Step 2: Convert to fraction form
   641,880/1,392,624 = 1,392,624/x
3. Step 3: Cross multiply
   641,880x = 1,392,624 × 1,392,624
4. Step 4: Simplify right side
   641,880x = 1,939,401,605,376
5. Step 5: Solve for x
   x = 1,939,401,605,376/641,880
6. Step 6: Final answer
   x = 3,021,439.53