Finding the Fourth Proportional to 104.76, 144.72 and 90.18

Step by Step Solution

1. Step 1: Write the proportion equation
   104.76 : 144.72 = 90.18 : x
2. Step 2: Convert to fraction form
   104.76/144.72 = 90.18/x
3. Step 3: Cross multiply
   104.76x = 144.72 × 90.18
4. Step 4: Simplify right side
   104.76x = 13,050.85
5. Step 5: Solve for x
   x = 13,050.85/104.76
6. Step 6: Final answer
   x = 124.58