Finding the Fourth Proportional to 72.78, 109.12 and 67.38

Step by Step Solution

1. Step 1: Write the proportion equation
   72.78 : 109.12 = 67.38 : x
2. Step 2: Convert to fraction form
   72.78/109.12 = 67.38/x
3. Step 3: Cross multiply
   72.78x = 109.12 × 67.38
4. Step 4: Simplify right side
   72.78x = 7,352.51
5. Step 5: Solve for x
   x = 7,352.51/72.78
6. Step 6: Final answer
   x = 101.02