Finding the Fourth Proportional to 78.49, 117.75 and 42.41

Step by Step Solution

1. Step 1: Write the proportion equation
   78.49 : 117.75 = 42.41 : x
2. Step 2: Convert to fraction form
   78.49/117.75 = 42.41/x
3. Step 3: Cross multiply
   78.49x = 117.75 × 42.41
4. Step 4: Simplify right side
   78.49x = 4,993.78
5. Step 5: Solve for x
   x = 4,993.78/78.49
6. Step 6: Final answer
   x = 63.62