Finding the Fourth Proportional to 162.42, 243.72 and 121.72

Step by Step Solution

1. Step 1: Write the proportion equation
   162.42 : 243.72 = 121.72 : x
2. Step 2: Convert to fraction form
   162.42/243.72 = 121.72/x
3. Step 3: Cross multiply
   162.42x = 243.72 × 121.72
4. Step 4: Simplify right side
   162.42x = 29,665.60
5. Step 5: Solve for x
   x = 29,665.60/162.42
6. Step 6: Final answer
   x = 182.65