Finding the Fourth Proportional to 76.82, 106.17 and 72.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76.82 : 106.17 = 72.72 : x
2. Step 2: Convert to fraction form
   76.82/106.17 = 72.72/x
3. Step 3: Cross multiply
   76.82x = 106.17 × 72.72
4. Step 4: Simplify right side
   76.82x = 7,720.15
5. Step 5: Solve for x
   x = 7,720.15/76.82
6. Step 6: Final answer
   x = 100.50