Finding the Third Proportional to 298,870.50 and 644,970

Step by Step Solution

1. Step 1: Write the proportion equation
   298,870.50 : 644,970 = 644,970 : x
2. Step 2: Convert to fraction form
   298,870.50/644,970 = 644,970/x
3. Step 3: Cross multiply
   298,870.50x = 644,970 × 644,970
4. Step 4: Simplify right side
   298,870.50x = 415,986,300,900
5. Step 5: Solve for x
   x = 415,986,300,900/298,870.50
6. Step 6: Final answer
   x = 1,391,861.36