Finding the Fourth Proportional to 128.82, 177.52 and 109.38

Step by Step Solution

1. Step 1: Write the proportion equation
   128.82 : 177.52 = 109.38 : x
2. Step 2: Convert to fraction form
   128.82/177.52 = 109.38/x
3. Step 3: Cross multiply
   128.82x = 177.52 × 109.38
4. Step 4: Simplify right side
   128.82x = 19,417.14
5. Step 5: Solve for x
   x = 19,417.14/128.82
6. Step 6: Final answer
   x = 150.73