Finding the Third Proportional to 128,839.50 and 192,666

Step by Step Solution

1. Step 1: Write the proportion equation
   128,839.50 : 192,666 = 192,666 : x
2. Step 2: Convert to fraction form
   128,839.50/192,666 = 192,666/x
3. Step 3: Cross multiply
   128,839.50x = 192,666 × 192,666
4. Step 4: Simplify right side
   128,839.50x = 37,120,187,556
5. Step 5: Solve for x
   x = 37,120,187,556/128,839.50
6. Step 6: Final answer
   x = 288,111.86