Finding the Third Proportional to 444,809 and 688,489.50

Step by Step Solution

1. Step 1: Write the proportion equation
   444,809 : 688,489.50 = 688,489.50 : x
2. Step 2: Convert to fraction form
   444,809/688,489.50 = 688,489.50/x
3. Step 3: Cross multiply
   444,809x = 688,489.50 × 688,489.50
4. Step 4: Simplify right side
   444,809x = 474,017,791,610.25
5. Step 5: Solve for x
   x = 474,017,791,610.25/444,809
6. Step 6: Final answer
   x = 1,065,665.92