Finding the Fourth Proportional to 111.38, 153.67 and 72.06

Step by Step Solution

1. Step 1: Write the proportion equation
   111.38 : 153.67 = 72.06 : x
2. Step 2: Convert to fraction form
   111.38/153.67 = 72.06/x
3. Step 3: Cross multiply
   111.38x = 153.67 × 72.06
4. Step 4: Simplify right side
   111.38x = 11,073.41
5. Step 5: Solve for x
   x = 11,073.41/111.38
6. Step 6: Final answer
   x = 99.42