Finding the Fourth Proportional to 111.94, 154.43 and 90.14

Step by Step Solution

1. Step 1: Write the proportion equation
   111.94 : 154.43 = 90.14 : x
2. Step 2: Convert to fraction form
   111.94/154.43 = 90.14/x
3. Step 3: Cross multiply
   111.94x = 154.43 × 90.14
4. Step 4: Simplify right side
   111.94x = 13,920.32
5. Step 5: Solve for x
   x = 13,920.32/111.94
6. Step 6: Final answer
   x = 124.36