Finding the Fourth Proportional to 105.15, 144.93 and 72.33

Step by Step Solution

1. Step 1: Write the proportion equation
   105.15 : 144.93 = 72.33 : x
2. Step 2: Convert to fraction form
   105.15/144.93 = 72.33/x
3. Step 3: Cross multiply
   105.15x = 144.93 × 72.33
4. Step 4: Simplify right side
   105.15x = 10,482.79
5. Step 5: Solve for x
   x = 10,482.79/105.15
6. Step 6: Final answer
   x = 99.69