Finding the Third Proportional to 298,849.50 and 644,913

Step by Step Solution

1. Step 1: Write the proportion equation
   298,849.50 : 644,913 = 644,913 : x
2. Step 2: Convert to fraction form
   298,849.50/644,913 = 644,913/x
3. Step 3: Cross multiply
   298,849.50x = 644,913 × 644,913
4. Step 4: Simplify right side
   298,849.50x = 415,912,777,569
5. Step 5: Solve for x
   x = 415,912,777,569/298,849.50
6. Step 6: Final answer
   x = 1,391,713.15