Finding the Fourth Proportional to 72.55, 108.82 and 31.94

Step by Step Solution

1. Step 1: Write the proportion equation
   72.55 : 108.82 = 31.94 : x
2. Step 2: Convert to fraction form
   72.55/108.82 = 31.94/x
3. Step 3: Cross multiply
   72.55x = 108.82 × 31.94
4. Step 4: Simplify right side
   72.55x = 3,475.71
5. Step 5: Solve for x
   x = 3,475.71/72.55
6. Step 6: Final answer
   x = 47.91