Finding the Fourth Proportional to 82.89, 124.03 and 72.18

Step by Step Solution

1. Step 1: Write the proportion equation
   82.89 : 124.03 = 72.18 : x
2. Step 2: Convert to fraction form
   82.89/124.03 = 72.18/x
3. Step 3: Cross multiply
   82.89x = 124.03 × 72.18
4. Step 4: Simplify right side
   82.89x = 8,952.49
5. Step 5: Solve for x
   x = 8,952.49/82.89
6. Step 6: Final answer
   x = 108.00