Finding the Fourth Proportional to 72.86, 109.31 and 38.61

Step by Step Solution

1. Step 1: Write the proportion equation
   72.86 : 109.31 = 38.61 : x
2. Step 2: Convert to fraction form
   72.86/109.31 = 38.61/x
3. Step 3: Cross multiply
   72.86x = 109.31 × 38.61
4. Step 4: Simplify right side
   72.86x = 4,221.00
5. Step 5: Solve for x
   x = 4,221.00/72.86
6. Step 6: Final answer
   x = 57.93