Finding the Fourth Proportional to 105.06, 144.88 and 86.60

Step by Step Solution

1. Step 1: Write the proportion equation
   105.06 : 144.88 = 86.60 : x
2. Step 2: Convert to fraction form
   105.06/144.88 = 86.60/x
3. Step 3: Cross multiply
   105.06x = 144.88 × 86.60
4. Step 4: Simplify right side
   105.06x = 12,546.61
5. Step 5: Solve for x
   x = 12,546.61/105.06
6. Step 6: Final answer
   x = 119.42