Finding the Fourth Proportional to 111.33, 153.36 and 100.53

Step by Step Solution

1. Step 1: Write the proportion equation
   111.33 : 153.36 = 100.53 : x
2. Step 2: Convert to fraction form
   111.33/153.36 = 100.53/x
3. Step 3: Cross multiply
   111.33x = 153.36 × 100.53
4. Step 4: Simplify right side
   111.33x = 15,417.28
5. Step 5: Solve for x
   x = 15,417.28/111.33
6. Step 6: Final answer
   x = 138.48