Finding the Fourth Proportional to 74.49, 111.78 and 42.02

Step by Step Solution

1. Step 1: Write the proportion equation
   74.49 : 111.78 = 42.02 : x
2. Step 2: Convert to fraction form
   74.49/111.78 = 42.02/x
3. Step 3: Cross multiply
   74.49x = 111.78 × 42.02
4. Step 4: Simplify right side
   74.49x = 4,696.86
5. Step 5: Solve for x
   x = 4,696.86/74.49
6. Step 6: Final answer
   x = 63.06