Finding the Fourth Proportional to 111.02, 153 and 100.54

Step by Step Solution

1. Step 1: Write the proportion equation
   111.02 : 153 = 100.54 : x
2. Step 2: Convert to fraction form
   111.02/153 = 100.54/x
3. Step 3: Cross multiply
   111.02x = 153 × 100.54
4. Step 4: Simplify right side
   111.02x = 15,382.62
5. Step 5: Solve for x
   x = 15,382.62/111.02
6. Step 6: Final answer
   x = 138.56