Finding the Fourth Proportional to 83.43, 125.12 and 42.82

Step by Step Solution

1. Step 1: Write the proportion equation
   83.43 : 125.12 = 42.82 : x
2. Step 2: Convert to fraction form
   83.43/125.12 = 42.82/x
3. Step 3: Cross multiply
   83.43x = 125.12 × 42.82
4. Step 4: Simplify right side
   83.43x = 5,357.43
5. Step 5: Solve for x
   x = 5,357.43/83.43
6. Step 6: Final answer
   x = 64.21