Finding the Third Proportional to 128.25 and 205.88

Step by Step Solution

1. Step 1: Write the proportion equation
   128.25 : 205.88 = 205.88 : x
2. Step 2: Convert to fraction form
   128.25/205.88 = 205.88/x
3. Step 3: Cross multiply
   128.25x = 205.88 × 205.88
4. Step 4: Simplify right side
   128.25x = 42,384.52
5. Step 5: Solve for x
   x = 42,384.52/128.25
6. Step 6: Final answer
   x = 330.48