Finding the Fourth Proportional to 72.49, 109.27 and 67.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72.49 : 109.27 = 67.78 : x
2. Step 2: Convert to fraction form
   72.49/109.27 = 67.78/x
3. Step 3: Cross multiply
   72.49x = 109.27 × 67.78
4. Step 4: Simplify right side
   72.49x = 7,405.98
5. Step 5: Solve for x
   x = 7,405.98/72.49
6. Step 6: Final answer
   x = 102.17