Finding the Fourth Proportional to 118.05, 162.72 and 89.61

Step by Step Solution

1. Step 1: Write the proportion equation
   118.05 : 162.72 = 89.61 : x
2. Step 2: Convert to fraction form
   118.05/162.72 = 89.61/x
3. Step 3: Cross multiply
   118.05x = 162.72 × 89.61
4. Step 4: Simplify right side
   118.05x = 14,581.34
5. Step 5: Solve for x
   x = 14,581.34/118.05
6. Step 6: Final answer
   x = 123.52