Finding the Fourth Proportional to 82.47, 123.01 and 72.84

Step by Step Solution

1. Step 1: Write the proportion equation
   82.47 : 123.01 = 72.84 : x
2. Step 2: Convert to fraction form
   82.47/123.01 = 72.84/x
3. Step 3: Cross multiply
   82.47x = 123.01 × 72.84
4. Step 4: Simplify right side
   82.47x = 8,960.05
5. Step 5: Solve for x
   x = 8,960.05/82.47
6. Step 6: Final answer
   x = 108.65