Finding the Fourth Proportional to 72.42, 99.94 and 39.67

Step by Step Solution

1. Step 1: Write the proportion equation
   72.42 : 99.94 = 39.67 : x
2. Step 2: Convert to fraction form
   72.42/99.94 = 39.67/x
3. Step 3: Cross multiply
   72.42x = 99.94 × 39.67
4. Step 4: Simplify right side
   72.42x = 3,965.02
5. Step 5: Solve for x
   x = 3,965.02/72.42
6. Step 6: Final answer
   x = 54.75