Finding the Third Proportional to 190,462.50 and 396,689

Step by Step Solution

1. Step 1: Write the proportion equation
   190,462.50 : 396,689 = 396,689 : x
2. Step 2: Convert to fraction form
   190,462.50/396,689 = 396,689/x
3. Step 3: Cross multiply
   190,462.50x = 396,689 × 396,689
4. Step 4: Simplify right side
   190,462.50x = 157,362,162,721
5. Step 5: Solve for x
   x = 157,362,162,721/190,462.50
6. Step 6: Final answer
   x = 826,210.74