Finding the Fourth Proportional to 42.39, 63.51 and 42.25

Step by Step Solution

1. Step 1: Write the proportion equation
   42.39 : 63.51 = 42.25 : x
2. Step 2: Convert to fraction form
   42.39/63.51 = 42.25/x
3. Step 3: Cross multiply
   42.39x = 63.51 × 42.25
4. Step 4: Simplify right side
   42.39x = 2,683.19
5. Step 5: Solve for x
   x = 2,683.19/42.39
6. Step 6: Final answer
   x = 63.31