Finding the Fourth Proportional to 111.32, 153.56 and 72.51

Step by Step Solution

1. Step 1: Write the proportion equation
   111.32 : 153.56 = 72.51 : x
2. Step 2: Convert to fraction form
   111.32/153.56 = 72.51/x
3. Step 3: Cross multiply
   111.32x = 153.56 × 72.51
4. Step 4: Simplify right side
   111.32x = 11,134.27
5. Step 5: Solve for x
   x = 11,134.27/111.32
6. Step 6: Final answer
   x = 100.02