Finding the Fourth Proportional to 111.94, 154.50 and 90.16

Step by Step Solution

1. Step 1: Write the proportion equation
   111.94 : 154.50 = 90.16 : x
2. Step 2: Convert to fraction form
   111.94/154.50 = 90.16/x
3. Step 3: Cross multiply
   111.94x = 154.50 × 90.16
4. Step 4: Simplify right side
   111.94x = 13,929.72
5. Step 5: Solve for x
   x = 13,929.72/111.94
6. Step 6: Final answer
   x = 124.44