Finding the Third Proportional to 644,142 and 1,399,274

Step by Step Solution

1. Step 1: Write the proportion equation
   644,142 : 1,399,274 = 1,399,274 : x
2. Step 2: Convert to fraction form
   644,142/1,399,274 = 1,399,274/x
3. Step 3: Cross multiply
   644,142x = 1,399,274 × 1,399,274
4. Step 4: Simplify right side
   644,142x = 1,957,967,727,076
5. Step 5: Solve for x
   x = 1,957,967,727,076/644,142
6. Step 6: Final answer
   x = 3,039,652.32