Finding the Fourth Proportional to 42.37, 63.56 and 15.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42.37 : 63.56 = 15.31 : x
2. Step 2: Convert to fraction form
   42.37/63.56 = 15.31/x
3. Step 3: Cross multiply
   42.37x = 63.56 × 15.31
4. Step 4: Simplify right side
   42.37x = 973.22
5. Step 5: Solve for x
   x = 973.22/42.37
6. Step 6: Final answer
   x = 22.97