Finding the Third Proportional to 388,215.50 and 823,087

Step by Step Solution

1. Step 1: Write the proportion equation
   388,215.50 : 823,087 = 823,087 : x
2. Step 2: Convert to fraction form
   388,215.50/823,087 = 823,087/x
3. Step 3: Cross multiply
   388,215.50x = 823,087 × 823,087
4. Step 4: Simplify right side
   388,215.50x = 677,472,209,569
5. Step 5: Solve for x
   x = 677,472,209,569/388,215.50
6. Step 6: Final answer
   x = 1,745,093.15