Finding the Fourth Proportional to 83.07, 124.58 and 42.47

Step by Step Solution

1. Step 1: Write the proportion equation
   83.07 : 124.58 = 42.47 : x
2. Step 2: Convert to fraction form
   83.07/124.58 = 42.47/x
3. Step 3: Cross multiply
   83.07x = 124.58 × 42.47
4. Step 4: Simplify right side
   83.07x = 5,290.40
5. Step 5: Solve for x
   x = 5,290.40/83.07
6. Step 6: Final answer
   x = 63.69