Finding the Fourth Proportional to 72.72, 108.27 and 71.91

Step by Step Solution

1. Step 1: Write the proportion equation
   72.72 : 108.27 = 71.91 : x
2. Step 2: Convert to fraction form
   72.72/108.27 = 71.91/x
3. Step 3: Cross multiply
   72.72x = 108.27 × 71.91
4. Step 4: Simplify right side
   72.72x = 7,785.70
5. Step 5: Solve for x
   x = 7,785.70/72.72
6. Step 6: Final answer
   x = 107.06