Finding the Fourth Proportional to 67.28, 100.78 and 34.72

Step by Step Solution

1. Step 1: Write the proportion equation
   67.28 : 100.78 = 34.72 : x
2. Step 2: Convert to fraction form
   67.28/100.78 = 34.72/x
3. Step 3: Cross multiply
   67.28x = 100.78 × 34.72
4. Step 4: Simplify right side
   67.28x = 3,498.74
5. Step 5: Solve for x
   x = 3,498.74/67.28
6. Step 6: Final answer
   x = 52.01