Finding the Fourth Proportional to 72.56, 108.67 and 43.28

Step by Step Solution

1. Step 1: Write the proportion equation
   72.56 : 108.67 = 43.28 : x
2. Step 2: Convert to fraction form
   72.56/108.67 = 43.28/x
3. Step 3: Cross multiply
   72.56x = 108.67 × 43.28
4. Step 4: Simplify right side
   72.56x = 4,703.56
5. Step 5: Solve for x
   x = 4,703.56/72.56
6. Step 6: Final answer
   x = 64.82