Finding the Third Proportional to 644,564 and 1,382,392

Step by Step Solution

1. Step 1: Write the proportion equation
   644,564 : 1,382,392 = 1,382,392 : x
2. Step 2: Convert to fraction form
   644,564/1,382,392 = 1,382,392/x
3. Step 3: Cross multiply
   644,564x = 1,382,392 × 1,382,392
4. Step 4: Simplify right side
   644,564x = 1,911,007,641,664
5. Step 5: Solve for x
   x = 1,911,007,641,664/644,564
6. Step 6: Final answer
   x = 2,964,806.66