Finding the Fourth Proportional to 72.65, 108.89 and 40.15

Step by Step Solution

1. Step 1: Write the proportion equation
   72.65 : 108.89 = 40.15 : x
2. Step 2: Convert to fraction form
   72.65/108.89 = 40.15/x
3. Step 3: Cross multiply
   72.65x = 108.89 × 40.15
4. Step 4: Simplify right side
   72.65x = 4,371.63
5. Step 5: Solve for x
   x = 4,371.63/72.65
6. Step 6: Final answer
   x = 60.18