Finding the Fourth Proportional to 82.72, 114.09 and 71.79

Step by Step Solution

1. Step 1: Write the proportion equation
   82.72 : 114.09 = 71.79 : x
2. Step 2: Convert to fraction form
   82.72/114.09 = 71.79/x
3. Step 3: Cross multiply
   82.72x = 114.09 × 71.79
4. Step 4: Simplify right side
   82.72x = 8,189.82
5. Step 5: Solve for x
   x = 8,189.82/82.72
6. Step 6: Final answer
   x = 99.01