Finding the Fourth Proportional to 72.56, 108.86 and 31.98

Step by Step Solution

1. Step 1: Write the proportion equation
   72.56 : 108.86 = 31.98 : x
2. Step 2: Convert to fraction form
   72.56/108.86 = 31.98/x
3. Step 3: Cross multiply
   72.56x = 108.86 × 31.98
4. Step 4: Simplify right side
   72.56x = 3,481.18
5. Step 5: Solve for x
   x = 3,481.18/72.56
6. Step 6: Final answer
   x = 47.98