Finding the Fourth Proportional to 72.88, 108.82 and 68.88

Step by Step Solution

1. Step 1: Write the proportion equation
   72.88 : 108.82 = 68.88 : x
2. Step 2: Convert to fraction form
   72.88/108.82 = 68.88/x
3. Step 3: Cross multiply
   72.88x = 108.82 × 68.88
4. Step 4: Simplify right side
   72.88x = 7,495.52
5. Step 5: Solve for x
   x = 7,495.52/72.88
6. Step 6: Final answer
   x = 102.85