Finding the Fourth Proportional to 105.06, 144.86 and 72.26

Step by Step Solution

1. Step 1: Write the proportion equation
   105.06 : 144.86 = 72.26 : x
2. Step 2: Convert to fraction form
   105.06/144.86 = 72.26/x
3. Step 3: Cross multiply
   105.06x = 144.86 × 72.26
4. Step 4: Simplify right side
   105.06x = 10,467.58
5. Step 5: Solve for x
   x = 10,467.58/105.06
6. Step 6: Final answer
   x = 99.63