Finding the Fourth Proportional to 72.88, 108.72 and 69.28

Step by Step Solution

1. Step 1: Write the proportion equation
   72.88 : 108.72 = 69.28 : x
2. Step 2: Convert to fraction form
   72.88/108.72 = 69.28/x
3. Step 3: Cross multiply
   72.88x = 108.72 × 69.28
4. Step 4: Simplify right side
   72.88x = 7,532.12
5. Step 5: Solve for x
   x = 7,532.12/72.88
6. Step 6: Final answer
   x = 103.35