Finding the Fourth Proportional to 42.42, 63.64 and 15.38

Step by Step Solution

1. Step 1: Write the proportion equation
   42.42 : 63.64 = 15.38 : x
2. Step 2: Convert to fraction form
   42.42/63.64 = 15.38/x
3. Step 3: Cross multiply
   42.42x = 63.64 × 15.38
4. Step 4: Simplify right side
   42.42x = 978.78
5. Step 5: Solve for x
   x = 978.78/42.42
6. Step 6: Final answer
   x = 23.07