Finding the Fourth Proportional to 105.08, 144.81 and 91.89

Step by Step Solution

1. Step 1: Write the proportion equation
   105.08 : 144.81 = 91.89 : x
2. Step 2: Convert to fraction form
   105.08/144.81 = 91.89/x
3. Step 3: Cross multiply
   105.08x = 144.81 × 91.89
4. Step 4: Simplify right side
   105.08x = 13,306.59
5. Step 5: Solve for x
   x = 13,306.59/105.08
6. Step 6: Final answer
   x = 126.64