Finding the Fourth Proportional to 42.15, 63.22 and 15.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42.15 : 63.22 = 15.10 : x
2. Step 2: Convert to fraction form
   42.15/63.22 = 15.10/x
3. Step 3: Cross multiply
   42.15x = 63.22 × 15.10
4. Step 4: Simplify right side
   42.15x = 954.43
5. Step 5: Solve for x
   x = 954.43/42.15
6. Step 6: Final answer
   x = 22.64