Finding the Third Proportional to 298,644.50 and 644,835.50

Step by Step Solution

1. Step 1: Write the proportion equation
   298,644.50 : 644,835.50 = 644,835.50 : x
2. Step 2: Convert to fraction form
   298,644.50/644,835.50 = 644,835.50/x
3. Step 3: Cross multiply
   298,644.50x = 644,835.50 × 644,835.50
4. Step 4: Simplify right side
   298,644.50x = 415,812,822,060.25
5. Step 5: Solve for x
   x = 415,812,822,060.25/298,644.50
6. Step 6: Final answer
   x = 1,392,333.77