Finding the Fourth Proportional to 162.72, 243.73 and 128.37

Step by Step Solution

1. Step 1: Write the proportion equation
   162.72 : 243.73 = 128.37 : x
2. Step 2: Convert to fraction form
   162.72/243.73 = 128.37/x
3. Step 3: Cross multiply
   162.72x = 243.73 × 128.37
4. Step 4: Simplify right side
   162.72x = 31,288.69
5. Step 5: Solve for x
   x = 31,288.69/162.72
6. Step 6: Final answer
   x = 192.29