Finding the Fourth Proportional to 72.51, 108.69 and 40.38

Step by Step Solution

1. Step 1: Write the proportion equation
   72.51 : 108.69 = 40.38 : x
2. Step 2: Convert to fraction form
   72.51/108.69 = 40.38/x
3. Step 3: Cross multiply
   72.51x = 108.69 × 40.38
4. Step 4: Simplify right side
   72.51x = 4,388.90
5. Step 5: Solve for x
   x = 4,388.90/72.51
6. Step 6: Final answer
   x = 60.53