Finding the Fourth Proportional to 71.78, 106.97 and 67.52

Step by Step Solution

1. Step 1: Write the proportion equation
   71.78 : 106.97 = 67.52 : x
2. Step 2: Convert to fraction form
   71.78/106.97 = 67.52/x
3. Step 3: Cross multiply
   71.78x = 106.97 × 67.52
4. Step 4: Simplify right side
   71.78x = 7,222.54
5. Step 5: Solve for x
   x = 7,222.54/71.78
6. Step 6: Final answer
   x = 100.63