Finding the Fourth Proportional to 74.69, 111.96 and 42.15

Step by Step Solution

1. Step 1: Write the proportion equation
   74.69 : 111.96 = 42.15 : x
2. Step 2: Convert to fraction form
   74.69/111.96 = 42.15/x
3. Step 3: Cross multiply
   74.69x = 111.96 × 42.15
4. Step 4: Simplify right side
   74.69x = 4,719.11
5. Step 5: Solve for x
   x = 4,719.11/74.69
6. Step 6: Final answer
   x = 63.19