Finding the Fourth Proportional to 162.17, 243.38 and 89.09

Step by Step Solution

1. Step 1: Write the proportion equation
   162.17 : 243.38 = 89.09 : x
2. Step 2: Convert to fraction form
   162.17/243.38 = 89.09/x
3. Step 3: Cross multiply
   162.17x = 243.38 × 89.09
4. Step 4: Simplify right side
   162.17x = 21,682.72
5. Step 5: Solve for x
   x = 21,682.72/162.17
6. Step 6: Final answer
   x = 133.70