Finding the Fourth Proportional to 82.18, 123.29 and 65.21

Step by Step Solution

1. Step 1: Write the proportion equation
   82.18 : 123.29 = 65.21 : x
2. Step 2: Convert to fraction form
   82.18/123.29 = 65.21/x
3. Step 3: Cross multiply
   82.18x = 123.29 × 65.21
4. Step 4: Simplify right side
   82.18x = 8,039.04
5. Step 5: Solve for x
   x = 8,039.04/82.18
6. Step 6: Final answer
   x = 97.82