Finding the Fourth Proportional to 72.39, 108.55 and 33.86

Step by Step Solution

1. Step 1: Write the proportion equation
   72.39 : 108.55 = 33.86 : x
2. Step 2: Convert to fraction form
   72.39/108.55 = 33.86/x
3. Step 3: Cross multiply
   72.39x = 108.55 × 33.86
4. Step 4: Simplify right side
   72.39x = 3,675.69
5. Step 5: Solve for x
   x = 3,675.69/72.39
6. Step 6: Final answer
   x = 50.78