Finding the Fourth Proportional to 72.82, 109.23 and 18.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72.82 : 109.23 = 18.72 : x
2. Step 2: Convert to fraction form
   72.82/109.23 = 18.72/x
3. Step 3: Cross multiply
   72.82x = 109.23 × 18.72
4. Step 4: Simplify right side
   72.82x = 2,044.15
5. Step 5: Solve for x
   x = 2,044.15/72.82
6. Step 6: Final answer
   x = 28.07