Finding the Fourth Proportional to 128.82, 176.72 and 126.12

Step by Step Solution

1. Step 1: Write the proportion equation
   128.82 : 176.72 = 126.12 : x
2. Step 2: Convert to fraction form
   128.82/176.72 = 126.12/x
3. Step 3: Cross multiply
   128.82x = 176.72 × 126.12
4. Step 4: Simplify right side
   128.82x = 22,287.30
5. Step 5: Solve for x
   x = 22,287.30/128.82
6. Step 6: Final answer
   x = 173.01