Finding the Fourth Proportional to 72.59, 108.71 and 40.02

Step by Step Solution

1. Step 1: Write the proportion equation
   72.59 : 108.71 = 40.02 : x
2. Step 2: Convert to fraction form
   72.59/108.71 = 40.02/x
3. Step 3: Cross multiply
   72.59x = 108.71 × 40.02
4. Step 4: Simplify right side
   72.59x = 4,350.37
5. Step 5: Solve for x
   x = 4,350.37/72.59
6. Step 6: Final answer
   x = 59.93