Finding the Fourth Proportional to 72.71, 109.06 and 31.56

Step by Step Solution

1. Step 1: Write the proportion equation
   72.71 : 109.06 = 31.56 : x
2. Step 2: Convert to fraction form
   72.71/109.06 = 31.56/x
3. Step 3: Cross multiply
   72.71x = 109.06 × 31.56
4. Step 4: Simplify right side
   72.71x = 3,441.78
5. Step 5: Solve for x
   x = 3,441.78/72.71
6. Step 6: Final answer
   x = 47.34