Finding the Fourth Proportional to 72.43, 108.56 and 38.15

Step by Step Solution

1. Step 1: Write the proportion equation
   72.43 : 108.56 = 38.15 : x
2. Step 2: Convert to fraction form
   72.43/108.56 = 38.15/x
3. Step 3: Cross multiply
   72.43x = 108.56 × 38.15
4. Step 4: Simplify right side
   72.43x = 4,141.93
5. Step 5: Solve for x
   x = 4,141.93/72.43
6. Step 6: Final answer
   x = 57.19