Finding the Fourth Proportional to 111.37, 153.72 and 72.07

Step by Step Solution

1. Step 1: Write the proportion equation
   111.37 : 153.72 = 72.07 : x
2. Step 2: Convert to fraction form
   111.37/153.72 = 72.07/x
3. Step 3: Cross multiply
   111.37x = 153.72 × 72.07
4. Step 4: Simplify right side
   111.37x = 11,078.50
5. Step 5: Solve for x
   x = 11,078.50/111.37
6. Step 6: Final answer
   x = 99.48