Finding the Fourth Proportional to 72.20, 108.83 and 67.74

Step by Step Solution

1. Step 1: Write the proportion equation
   72.20 : 108.83 = 67.74 : x
2. Step 2: Convert to fraction form
   72.20/108.83 = 67.74/x
3. Step 3: Cross multiply
   72.20x = 108.83 × 67.74
4. Step 4: Simplify right side
   72.20x = 7,371.81
5. Step 5: Solve for x
   x = 7,371.81/72.20
6. Step 6: Final answer
   x = 102.11