Finding the Fourth Proportional to 82.17, 123.21 and 60.75

Step by Step Solution

1. Step 1: Write the proportion equation
   82.17 : 123.21 = 60.75 : x
2. Step 2: Convert to fraction form
   82.17/123.21 = 60.75/x
3. Step 3: Cross multiply
   82.17x = 123.21 × 60.75
4. Step 4: Simplify right side
   82.17x = 7,485.01
5. Step 5: Solve for x
   x = 7,485.01/82.17
6. Step 6: Final answer
   x = 91.09