Finding the Fourth Proportional to 111.51, 153.63 and 72.63

Step by Step Solution

1. Step 1: Write the proportion equation
   111.51 : 153.63 = 72.63 : x
2. Step 2: Convert to fraction form
   111.51/153.63 = 72.63/x
3. Step 3: Cross multiply
   111.51x = 153.63 × 72.63
4. Step 4: Simplify right side
   111.51x = 11,158.15
5. Step 5: Solve for x
   x = 11,158.15/111.51
6. Step 6: Final answer
   x = 100.06