Finding the Fourth Proportional to 111.32, 153.60 and 72.56

Step by Step Solution

1. Step 1: Write the proportion equation
   111.32 : 153.60 = 72.56 : x
2. Step 2: Convert to fraction form
   111.32/153.60 = 72.56/x
3. Step 3: Cross multiply
   111.32x = 153.60 × 72.56
4. Step 4: Simplify right side
   111.32x = 11,145.22
5. Step 5: Solve for x
   x = 11,145.22/111.32
6. Step 6: Final answer
   x = 100.12