Finding the Fourth Proportional to 72.56, 108.90 and 72.24

Step by Step Solution

1. Step 1: Write the proportion equation
   72.56 : 108.90 = 72.24 : x
2. Step 2: Convert to fraction form
   72.56/108.90 = 72.24/x
3. Step 3: Cross multiply
   72.56x = 108.90 × 72.24
4. Step 4: Simplify right side
   72.56x = 7,866.94
5. Step 5: Solve for x
   x = 7,866.94/72.56
6. Step 6: Final answer
   x = 108.43