Finding the Fourth Proportional to 15.72, 23.71 and 15.72

Step by Step Solution

1. Step 1: Write the proportion equation
   15.72 : 23.71 = 15.72 : x
2. Step 2: Convert to fraction form
   15.72/23.71 = 15.72/x
3. Step 3: Cross multiply
   15.72x = 23.71 × 15.72
4. Step 4: Simplify right side
   15.72x = 372.72
5. Step 5: Solve for x
   x = 372.72/15.72
6. Step 6: Final answer
   x = 23.71