Finding the Third Proportional to 128,067.50 and 205,770

Step by Step Solution

1. Step 1: Write the proportion equation
   128,067.50 : 205,770 = 205,770 : x
2. Step 2: Convert to fraction form
   128,067.50/205,770 = 205,770/x
3. Step 3: Cross multiply
   128,067.50x = 205,770 × 205,770
4. Step 4: Simplify right side
   128,067.50x = 42,341,292,900
5. Step 5: Solve for x
   x = 42,341,292,900/128,067.50
6. Step 6: Final answer
   x = 330,617.00