Finding the Fourth Proportional to 82.12, 123.15 and 34

Step by Step Solution

1. Step 1: Write the proportion equation
   82.12 : 123.15 = 34 : x
2. Step 2: Convert to fraction form
   82.12/123.15 = 34/x
3. Step 3: Cross multiply
   82.12x = 123.15 × 34
4. Step 4: Simplify right side
   82.12x = 4,187.10
5. Step 5: Solve for x
   x = 4,187.10/82.12
6. Step 6: Final answer
   x = 50.99