Finding the Fourth Proportional to 162.69, 243.72 and 111.21

Step by Step Solution

1. Step 1: Write the proportion equation
   162.69 : 243.72 = 111.21 : x
2. Step 2: Convert to fraction form
   162.69/243.72 = 111.21/x
3. Step 3: Cross multiply
   162.69x = 243.72 × 111.21
4. Step 4: Simplify right side
   162.69x = 27,104.10
5. Step 5: Solve for x
   x = 27,104.10/162.69
6. Step 6: Final answer
   x = 166.60