Finding the Third Proportional to 644,586 and 1,403,868

Step by Step Solution

1. Step 1: Write the proportion equation
   644,586 : 1,403,868 = 1,403,868 : x
2. Step 2: Convert to fraction form
   644,586/1,403,868 = 1,403,868/x
3. Step 3: Cross multiply
   644,586x = 1,403,868 × 1,403,868
4. Step 4: Simplify right side
   644,586x = 1,970,845,361,424
5. Step 5: Solve for x
   x = 1,970,845,361,424/644,586
6. Step 6: Final answer
   x = 3,057,536.72