Finding the Fourth Proportional to 42.42, 63.56 and 34.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42.42 : 63.56 = 34.78 : x
2. Step 2: Convert to fraction form
   42.42/63.56 = 34.78/x
3. Step 3: Cross multiply
   42.42x = 63.56 × 34.78
4. Step 4: Simplify right side
   42.42x = 2,210.62
5. Step 5: Solve for x
   x = 2,210.62/42.42
6. Step 6: Final answer
   x = 52.11