Finding the Fourth Proportional to 111.44, 153.72 and 72.56

Step by Step Solution

1. Step 1: Write the proportion equation
   111.44 : 153.72 = 72.56 : x
2. Step 2: Convert to fraction form
   111.44/153.72 = 72.56/x
3. Step 3: Cross multiply
   111.44x = 153.72 × 72.56
4. Step 4: Simplify right side
   111.44x = 11,153.92
5. Step 5: Solve for x
   x = 11,153.92/111.44
6. Step 6: Final answer
   x = 100.09