Finding the Fourth Proportional to 258.50, 387.75 and 82.82

Step by Step Solution

1. Step 1: Write the proportion equation
   258.50 : 387.75 = 82.82 : x
2. Step 2: Convert to fraction form
   258.50/387.75 = 82.82/x
3. Step 3: Cross multiply
   258.50x = 387.75 × 82.82
4. Step 4: Simplify right side
   258.50x = 32,111.83
5. Step 5: Solve for x
   x = 32,111.83/258.50
6. Step 6: Final answer
   x = 124.23