Finding the Fourth Proportional to 42.39, 63 and 42.26

Step by Step Solution

1. Step 1: Write the proportion equation
   42.39 : 63 = 42.26 : x
2. Step 2: Convert to fraction form
   42.39/63 = 42.26/x
3. Step 3: Cross multiply
   42.39x = 63 × 42.26
4. Step 4: Simplify right side
   42.39x = 2,662.07
5. Step 5: Solve for x
   x = 2,662.07/42.39
6. Step 6: Final answer
   x = 62.80