Finding the Fourth Proportional to 72.42, 108.69 and 68.66

Step by Step Solution

1. Step 1: Write the proportion equation
   72.42 : 108.69 = 68.66 : x
2. Step 2: Convert to fraction form
   72.42/108.69 = 68.66/x
3. Step 3: Cross multiply
   72.42x = 108.69 × 68.66
4. Step 4: Simplify right side
   72.42x = 7,462.31
5. Step 5: Solve for x
   x = 7,462.31/72.42
6. Step 6: Final answer
   x = 103.04