Finding the Fourth Proportional to 111.33, 153.69 and 102.54

Step by Step Solution

1. Step 1: Write the proportion equation
   111.33 : 153.69 = 102.54 : x
2. Step 2: Convert to fraction form
   111.33/153.69 = 102.54/x
3. Step 3: Cross multiply
   111.33x = 153.69 × 102.54
4. Step 4: Simplify right side
   111.33x = 15,759.37
5. Step 5: Solve for x
   x = 15,759.37/111.33
6. Step 6: Final answer
   x = 141.56