Finding the Fourth Proportional to 82.80, 123.63 and 72.96

Step by Step Solution

1. Step 1: Write the proportion equation
   82.80 : 123.63 = 72.96 : x
2. Step 2: Convert to fraction form
   82.80/123.63 = 72.96/x
3. Step 3: Cross multiply
   82.80x = 123.63 × 72.96
4. Step 4: Simplify right side
   82.80x = 9,020.04
5. Step 5: Solve for x
   x = 9,020.04/82.80
6. Step 6: Final answer
   x = 108.94