Finding the Fourth Proportional to 82.10, 123.15 and 50.18

Step by Step Solution

1. Step 1: Write the proportion equation
   82.10 : 123.15 = 50.18 : x
2. Step 2: Convert to fraction form
   82.10/123.15 = 50.18/x
3. Step 3: Cross multiply
   82.10x = 123.15 × 50.18
4. Step 4: Simplify right side
   82.10x = 6,179.67
5. Step 5: Solve for x
   x = 6,179.67/82.10
6. Step 6: Final answer
   x = 75.27