Finding the Fourth Proportional to 111.98, 154.53 and 65.34

Step by Step Solution

1. Step 1: Write the proportion equation
   111.98 : 154.53 = 65.34 : x
2. Step 2: Convert to fraction form
   111.98/154.53 = 65.34/x
3. Step 3: Cross multiply
   111.98x = 154.53 × 65.34
4. Step 4: Simplify right side
   111.98x = 10,096.99
5. Step 5: Solve for x
   x = 10,096.99/111.98
6. Step 6: Final answer
   x = 90.17