Finding the Fourth Proportional to 111.76, 154.22 and 65.76

Step by Step Solution

1. Step 1: Write the proportion equation
   111.76 : 154.22 = 65.76 : x
2. Step 2: Convert to fraction form
   111.76/154.22 = 65.76/x
3. Step 3: Cross multiply
   111.76x = 154.22 × 65.76
4. Step 4: Simplify right side
   111.76x = 10,141.51
5. Step 5: Solve for x
   x = 10,141.51/111.76
6. Step 6: Final answer
   x = 90.74