Finding the Fourth Proportional to 72.63, 108.96 and 71.49

Step by Step Solution

1. Step 1: Write the proportion equation
   72.63 : 108.96 = 71.49 : x
2. Step 2: Convert to fraction form
   72.63/108.96 = 71.49/x
3. Step 3: Cross multiply
   72.63x = 108.96 × 71.49
4. Step 4: Simplify right side
   72.63x = 7,789.55
5. Step 5: Solve for x
   x = 7,789.55/72.63
6. Step 6: Final answer
   x = 107.25