Finding the Fourth Proportional to 72.82, 109.23 and 68.56

Step by Step Solution

1. Step 1: Write the proportion equation
   72.82 : 109.23 = 68.56 : x
2. Step 2: Convert to fraction form
   72.82/109.23 = 68.56/x
3. Step 3: Cross multiply
   72.82x = 109.23 × 68.56
4. Step 4: Simplify right side
   72.82x = 7,488.81
5. Step 5: Solve for x
   x = 7,488.81/72.82
6. Step 6: Final answer
   x = 102.84