Finding the Fourth Proportional to 72.29, 108.50 and 31.73

Step by Step Solution

1. Step 1: Write the proportion equation
   72.29 : 108.50 = 31.73 : x
2. Step 2: Convert to fraction form
   72.29/108.50 = 31.73/x
3. Step 3: Cross multiply
   72.29x = 108.50 × 31.73
4. Step 4: Simplify right side
   72.29x = 3,442.55
5. Step 5: Solve for x
   x = 3,442.55/72.29
6. Step 6: Final answer
   x = 47.62