Finding the Fourth Proportional to 108.69, 161.82 and 108.15

Step by Step Solution

1. Step 1: Write the proportion equation
   108.69 : 161.82 = 108.15 : x
2. Step 2: Convert to fraction form
   108.69/161.82 = 108.15/x
3. Step 3: Cross multiply
   108.69x = 161.82 × 108.15
4. Step 4: Simplify right side
   108.69x = 17,500.83
5. Step 5: Solve for x
   x = 17,500.83/108.69
6. Step 6: Final answer
   x = 161.02