Finding the Fourth Proportional to 72.66, 108.72 and 68.34

Step by Step Solution

1. Step 1: Write the proportion equation
   72.66 : 108.72 = 68.34 : x
2. Step 2: Convert to fraction form
   72.66/108.72 = 68.34/x
3. Step 3: Cross multiply
   72.66x = 108.72 × 68.34
4. Step 4: Simplify right side
   72.66x = 7,429.92
5. Step 5: Solve for x
   x = 7,429.92/72.66
6. Step 6: Final answer
   x = 102.26