Finding the Fourth Proportional to 72.84, 100.52 and 40.09

Step by Step Solution

1. Step 1: Write the proportion equation
   72.84 : 100.52 = 40.09 : x
2. Step 2: Convert to fraction form
   72.84/100.52 = 40.09/x
3. Step 3: Cross multiply
   72.84x = 100.52 × 40.09
4. Step 4: Simplify right side
   72.84x = 4,029.97
5. Step 5: Solve for x
   x = 4,029.97/72.84
6. Step 6: Final answer
   x = 55.33