Finding the Fourth Proportional to 42.70, 63.50 and 42.25

Step by Step Solution

1. Step 1: Write the proportion equation
   42.70 : 63.50 = 42.25 : x
2. Step 2: Convert to fraction form
   42.70/63.50 = 42.25/x
3. Step 3: Cross multiply
   42.70x = 63.50 × 42.25
4. Step 4: Simplify right side
   42.70x = 2,682.58
5. Step 5: Solve for x
   x = 2,682.58/42.70
6. Step 6: Final answer
   x = 62.83