Finding the Fourth Proportional to 105.09, 144.72 and 90.22

Step by Step Solution

1. Step 1: Write the proportion equation
   105.09 : 144.72 = 90.22 : x
2. Step 2: Convert to fraction form
   105.09/144.72 = 90.22/x
3. Step 3: Cross multiply
   105.09x = 144.72 × 90.22
4. Step 4: Simplify right side
   105.09x = 13,056.45
5. Step 5: Solve for x
   x = 13,056.45/105.09
6. Step 6: Final answer
   x = 124.24