Finding the Fourth Proportional to 82.17, 123.18 and 69.30

Step by Step Solution

1. Step 1: Write the proportion equation
   82.17 : 123.18 = 69.30 : x
2. Step 2: Convert to fraction form
   82.17/123.18 = 69.30/x
3. Step 3: Cross multiply
   82.17x = 123.18 × 69.30
4. Step 4: Simplify right side
   82.17x = 8,536.37
5. Step 5: Solve for x
   x = 8,536.37/82.17
6. Step 6: Final answer
   x = 103.89