Finding the Fourth Proportional to 78.74, 118.14 and 42.67

Step by Step Solution

1. Step 1: Write the proportion equation
   78.74 : 118.14 = 42.67 : x
2. Step 2: Convert to fraction form
   78.74/118.14 = 42.67/x
3. Step 3: Cross multiply
   78.74x = 118.14 × 42.67
4. Step 4: Simplify right side
   78.74x = 5,040.74
5. Step 5: Solve for x
   x = 5,040.74/78.74
6. Step 6: Final answer
   x = 64.02