Finding the Fourth Proportional to 111.29, 153.62 and 72.47

Step by Step Solution

1. Step 1: Write the proportion equation
   111.29 : 153.62 = 72.47 : x
2. Step 2: Convert to fraction form
   111.29/153.62 = 72.47/x
3. Step 3: Cross multiply
   111.29x = 153.62 × 72.47
4. Step 4: Simplify right side
   111.29x = 11,131.71
5. Step 5: Solve for x
   x = 11,131.71/111.29
6. Step 6: Final answer
   x = 100.03