Finding the Fourth Proportional to 83.09, 124.60 and 42.49

Step by Step Solution

1. Step 1: Write the proportion equation
   83.09 : 124.60 = 42.49 : x
2. Step 2: Convert to fraction form
   83.09/124.60 = 42.49/x
3. Step 3: Cross multiply
   83.09x = 124.60 × 42.49
4. Step 4: Simplify right side
   83.09x = 5,294.25
5. Step 5: Solve for x
   x = 5,294.25/83.09
6. Step 6: Final answer
   x = 63.72