Finding the Third Proportional to 303,705 and 644,782.50

Step by Step Solution

1. Step 1: Write the proportion equation
   303,705 : 644,782.50 = 644,782.50 : x
2. Step 2: Convert to fraction form
   303,705/644,782.50 = 644,782.50/x
3. Step 3: Cross multiply
   303,705x = 644,782.50 × 644,782.50
4. Step 4: Simplify right side
   303,705x = 415,744,472,306.25
5. Step 5: Solve for x
   x = 415,744,472,306.25/303,705
6. Step 6: Final answer
   x = 1,368,908.88