Finding the Third Proportional to 388,845 and 808,728.50

Step by Step Solution

1. Step 1: Write the proportion equation
   388,845 : 808,728.50 = 808,728.50 : x
2. Step 2: Convert to fraction form
   388,845/808,728.50 = 808,728.50/x
3. Step 3: Cross multiply
   388,845x = 808,728.50 × 808,728.50
4. Step 4: Simplify right side
   388,845x = 654,041,786,712.25
5. Step 5: Solve for x
   x = 654,041,786,712.25/388,845
6. Step 6: Final answer
   x = 1,682,011.56