Finding the Fourth Proportional to 82.99, 123.82 and 82.50

Step by Step Solution

1. Step 1: Write the proportion equation
   82.99 : 123.82 = 82.50 : x
2. Step 2: Convert to fraction form
   82.99/123.82 = 82.50/x
3. Step 3: Cross multiply
   82.99x = 123.82 × 82.50
4. Step 4: Simplify right side
   82.99x = 10,215.15
5. Step 5: Solve for x
   x = 10,215.15/82.99
6. Step 6: Final answer
   x = 123.09