Finding the Fourth Proportional to 72.78, 109.08 and 38.09

Step by Step Solution

1. Step 1: Write the proportion equation
   72.78 : 109.08 = 38.09 : x
2. Step 2: Convert to fraction form
   72.78/109.08 = 38.09/x
3. Step 3: Cross multiply
   72.78x = 109.08 × 38.09
4. Step 4: Simplify right side
   72.78x = 4,154.86
5. Step 5: Solve for x
   x = 4,154.86/72.78
6. Step 6: Final answer
   x = 57.09