Finding the Fourth Proportional to 82.29, 123.63 and 72.16

Step by Step Solution

1. Step 1: Write the proportion equation
   82.29 : 123.63 = 72.16 : x
2. Step 2: Convert to fraction form
   82.29/123.63 = 72.16/x
3. Step 3: Cross multiply
   82.29x = 123.63 × 72.16
4. Step 4: Simplify right side
   82.29x = 8,921.14
5. Step 5: Solve for x
   x = 8,921.14/82.29
6. Step 6: Final answer
   x = 108.41