Finding the Fourth Proportional to 42.25, 63.38 and 42.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42.25 : 63.38 = 42.10 : x
2. Step 2: Convert to fraction form
   42.25/63.38 = 42.10/x
3. Step 3: Cross multiply
   42.25x = 63.38 × 42.10
4. Step 4: Simplify right side
   42.25x = 2,668.30
5. Step 5: Solve for x
   x = 2,668.30/42.25
6. Step 6: Final answer
   x = 63.15