Finding the Fourth Proportional to 72.27, 108.34 and 28.91

Step by Step Solution

1. Step 1: Write the proportion equation
   72.27 : 108.34 = 28.91 : x
2. Step 2: Convert to fraction form
   72.27/108.34 = 28.91/x
3. Step 3: Cross multiply
   72.27x = 108.34 × 28.91
4. Step 4: Simplify right side
   72.27x = 3,132.31
5. Step 5: Solve for x
   x = 3,132.31/72.27
6. Step 6: Final answer
   x = 43.34