Finding the Fourth Proportional to 162.72, 243.72 and 126.36

Step by Step Solution

1. Step 1: Write the proportion equation
   162.72 : 243.72 = 126.36 : x
2. Step 2: Convert to fraction form
   162.72/243.72 = 126.36/x
3. Step 3: Cross multiply
   162.72x = 243.72 × 126.36
4. Step 4: Simplify right side
   162.72x = 30,796.46
5. Step 5: Solve for x
   x = 30,796.46/162.72
6. Step 6: Final answer
   x = 189.26