Finding the Fourth Proportional to 42.56, 63.48 and 42.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42.56 : 63.48 = 42.04 : x
2. Step 2: Convert to fraction form
   42.56/63.48 = 42.04/x
3. Step 3: Cross multiply
   42.56x = 63.48 × 42.04
4. Step 4: Simplify right side
   42.56x = 2,668.70
5. Step 5: Solve for x
   x = 2,668.70/42.56
6. Step 6: Final answer
   x = 62.70