Finding the Fourth Proportional to 83.05, 124.59 and 42.43

Step by Step Solution

1. Step 1: Write the proportion equation
   83.05 : 124.59 = 42.43 : x
2. Step 2: Convert to fraction form
   83.05/124.59 = 42.43/x
3. Step 3: Cross multiply
   83.05x = 124.59 × 42.43
4. Step 4: Simplify right side
   83.05x = 5,286.35
5. Step 5: Solve for x
   x = 5,286.35/83.05
6. Step 6: Final answer
   x = 63.65