Finding the Fourth Proportional to 72.88, 109.33 and 31.74

Step by Step Solution

1. Step 1: Write the proportion equation
   72.88 : 109.33 = 31.74 : x
2. Step 2: Convert to fraction form
   72.88/109.33 = 31.74/x
3. Step 3: Cross multiply
   72.88x = 109.33 × 31.74
4. Step 4: Simplify right side
   72.88x = 3,469.98
5. Step 5: Solve for x
   x = 3,469.98/72.88
6. Step 6: Final answer
   x = 47.62