Finding the Fourth Proportional to 111.82, 154.28 and 65.20

Step by Step Solution

1. Step 1: Write the proportion equation
   111.82 : 154.28 = 65.20 : x
2. Step 2: Convert to fraction form
   111.82/154.28 = 65.20/x
3. Step 3: Cross multiply
   111.82x = 154.28 × 65.20
4. Step 4: Simplify right side
   111.82x = 10,058.28
5. Step 5: Solve for x
   x = 10,058.28/111.82
6. Step 6: Final answer
   x = 89.95