Finding the Fourth Proportional to 72.15, 108.24 and 43.32

Step by Step Solution

1. Step 1: Write the proportion equation
   72.15 : 108.24 = 43.32 : x
2. Step 2: Convert to fraction form
   72.15/108.24 = 43.32/x
3. Step 3: Cross multiply
   72.15x = 108.24 × 43.32
4. Step 4: Simplify right side
   72.15x = 4,688.96
5. Step 5: Solve for x
   x = 4,688.96/72.15
6. Step 6: Final answer
   x = 64.99