Finding the Fourth Proportional to 72.03, 108.05 and 28.69

Step by Step Solution

1. Step 1: Write the proportion equation
   72.03 : 108.05 = 28.69 : x
2. Step 2: Convert to fraction form
   72.03/108.05 = 28.69/x
3. Step 3: Cross multiply
   72.03x = 108.05 × 28.69
4. Step 4: Simplify right side
   72.03x = 3,100.22
5. Step 5: Solve for x
   x = 3,100.22/72.03
6. Step 6: Final answer
   x = 43.04