Finding the Fourth Proportional to 72.24, 99.64 and 42.73

Step by Step Solution

1. Step 1: Write the proportion equation
   72.24 : 99.64 = 42.73 : x
2. Step 2: Convert to fraction form
   72.24/99.64 = 42.73/x
3. Step 3: Cross multiply
   72.24x = 99.64 × 42.73
4. Step 4: Simplify right side
   72.24x = 4,257.42
5. Step 5: Solve for x
   x = 4,257.42/72.24
6. Step 6: Final answer
   x = 58.94