Finding the Fourth Proportional to 111.96, 154.50 and 65.34

Step by Step Solution

1. Step 1: Write the proportion equation
   111.96 : 154.50 = 65.34 : x
2. Step 2: Convert to fraction form
   111.96/154.50 = 65.34/x
3. Step 3: Cross multiply
   111.96x = 154.50 × 65.34
4. Step 4: Simplify right side
   111.96x = 10,095.03
5. Step 5: Solve for x
   x = 10,095.03/111.96
6. Step 6: Final answer
   x = 90.17