Finding the Fourth Proportional to 72.06, 108.05 and 28.73

Step by Step Solution

1. Step 1: Write the proportion equation
   72.06 : 108.05 = 28.73 : x
2. Step 2: Convert to fraction form
   72.06/108.05 = 28.73/x
3. Step 3: Cross multiply
   72.06x = 108.05 × 28.73
4. Step 4: Simplify right side
   72.06x = 3,103.59
5. Step 5: Solve for x
   x = 3,103.59/72.06
6. Step 6: Final answer
   x = 43.07