Finding the Fourth Proportional to 111.50, 153.74 and 72.62

Step by Step Solution

1. Step 1: Write the proportion equation
   111.50 : 153.74 = 72.62 : x
2. Step 2: Convert to fraction form
   111.50/153.74 = 72.62/x
3. Step 3: Cross multiply
   111.50x = 153.74 × 72.62
4. Step 4: Simplify right side
   111.50x = 11,164.60
5. Step 5: Solve for x
   x = 11,164.60/111.50
6. Step 6: Final answer
   x = 100.13