Finding the Third Proportional to 644,558 and 1,382,380

Step by Step Solution

1. Step 1: Write the proportion equation
   644,558 : 1,382,380 = 1,382,380 : x
2. Step 2: Convert to fraction form
   644,558/1,382,380 = 1,382,380/x
3. Step 3: Cross multiply
   644,558x = 1,382,380 × 1,382,380
4. Step 4: Simplify right side
   644,558x = 1,910,974,464,400
5. Step 5: Solve for x
   x = 1,910,974,464,400/644,558
6. Step 6: Final answer
   x = 2,964,782.79