Finding the Third Proportional to 644,648 and 1,403,992

Step by Step Solution

1. Step 1: Write the proportion equation
   644,648 : 1,403,992 = 1,403,992 : x
2. Step 2: Convert to fraction form
   644,648/1,403,992 = 1,403,992/x
3. Step 3: Cross multiply
   644,648x = 1,403,992 × 1,403,992
4. Step 4: Simplify right side
   644,648x = 1,971,193,536,064
5. Step 5: Solve for x
   x = 1,971,193,536,064/644,648
6. Step 6: Final answer
   x = 3,057,782.75