Finding the Fourth Proportional to 105.49, 158.10 and 89.18

Step by Step Solution

1. Step 1: Write the proportion equation
   105.49 : 158.10 = 89.18 : x
2. Step 2: Convert to fraction form
   105.49/158.10 = 89.18/x
3. Step 3: Cross multiply
   105.49x = 158.10 × 89.18
4. Step 4: Simplify right side
   105.49x = 14,100.22
5. Step 5: Solve for x
   x = 14,100.22/105.49
6. Step 6: Final answer
   x = 133.67