Finding the Fourth Proportional to 301.72, 452.56 and 128.32

Step by Step Solution

1. Step 1: Write the proportion equation
   301.72 : 452.56 = 128.32 : x
2. Step 2: Convert to fraction form
   301.72/452.56 = 128.32/x
3. Step 3: Cross multiply
   301.72x = 452.56 × 128.32
4. Step 4: Simplify right side
   301.72x = 58,072.50
5. Step 5: Solve for x
   x = 58,072.50/301.72
6. Step 6: Final answer
   x = 192.47