Finding the Fourth Proportional to 72.99, 100.72 and 40.24

Step by Step Solution

1. Step 1: Write the proportion equation
   72.99 : 100.72 = 40.24 : x
2. Step 2: Convert to fraction form
   72.99/100.72 = 40.24/x
3. Step 3: Cross multiply
   72.99x = 100.72 × 40.24
4. Step 4: Simplify right side
   72.99x = 4,052.57
5. Step 5: Solve for x
   x = 4,052.57/72.99
6. Step 6: Final answer
   x = 55.53