Finding the Third Proportional to 187,105.50 and 399,087

Step by Step Solution

1. Step 1: Write the proportion equation
   187,105.50 : 399,087 = 399,087 : x
2. Step 2: Convert to fraction form
   187,105.50/399,087 = 399,087/x
3. Step 3: Cross multiply
   187,105.50x = 399,087 × 399,087
4. Step 4: Simplify right side
   187,105.50x = 159,270,433,569
5. Step 5: Solve for x
   x = 159,270,433,569/187,105.50
6. Step 6: Final answer
   x = 851,233.31