Finding the Fourth Proportional to 72.71, 108.37 and 72.60

Step by Step Solution

1. Step 1: Write the proportion equation
   72.71 : 108.37 = 72.60 : x
2. Step 2: Convert to fraction form
   72.71/108.37 = 72.60/x
3. Step 3: Cross multiply
   72.71x = 108.37 × 72.60
4. Step 4: Simplify right side
   72.71x = 7,867.30
5. Step 5: Solve for x
   x = 7,867.30/72.71
6. Step 6: Final answer
   x = 108.20