Finding the Fourth Proportional to 105.08, 144.96 and 90.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105.08 : 144.96 = 90.50 : x
2. Step 2: Convert to fraction form
   105.08/144.96 = 90.50/x
3. Step 3: Cross multiply
   105.08x = 144.96 × 90.50
4. Step 4: Simplify right side
   105.08x = 13,118.88
5. Step 5: Solve for x
   x = 13,118.88/105.08
6. Step 6: Final answer
   x = 124.85