Finding the Third Proportional to 128,578.50 and 192,744

Step by Step Solution

1. Step 1: Write the proportion equation
   128,578.50 : 192,744 = 192,744 : x
2. Step 2: Convert to fraction form
   128,578.50/192,744 = 192,744/x
3. Step 3: Cross multiply
   128,578.50x = 192,744 × 192,744
4. Step 4: Simplify right side
   128,578.50x = 37,150,249,536
5. Step 5: Solve for x
   x = 37,150,249,536/128,578.50
6. Step 6: Final answer
   x = 288,930.49