Finding the Fourth Proportional to 111.50, 153.88 and 72.76

Step by Step Solution

1. Step 1: Write the proportion equation
   111.50 : 153.88 = 72.76 : x
2. Step 2: Convert to fraction form
   111.50/153.88 = 72.76/x
3. Step 3: Cross multiply
   111.50x = 153.88 × 72.76
4. Step 4: Simplify right side
   111.50x = 11,196.31
5. Step 5: Solve for x
   x = 11,196.31/111.50
6. Step 6: Final answer
   x = 100.42