Finding the Third Proportional to 128.67 and 174.45

Step by Step Solution

1. Step 1: Write the proportion equation
   128.67 : 174.45 = 174.45 : x
2. Step 2: Convert to fraction form
   128.67/174.45 = 174.45/x
3. Step 3: Cross multiply
   128.67x = 174.45 × 174.45
4. Step 4: Simplify right side
   128.67x = 30,431.17
5. Step 5: Solve for x
   x = 30,431.17/128.67
6. Step 6: Final answer
   x = 236.50