Finding the Third Proportional to 644,756 and 1,384,664

Step by Step Solution

1. Step 1: Write the proportion equation
   644,756 : 1,384,664 = 1,384,664 : x
2. Step 2: Convert to fraction form
   644,756/1,384,664 = 1,384,664/x
3. Step 3: Cross multiply
   644,756x = 1,384,664 × 1,384,664
4. Step 4: Simplify right side
   644,756x = 1,917,294,392,896
5. Step 5: Solve for x
   x = 1,917,294,392,896/644,756
6. Step 6: Final answer
   x = 2,973,674.37