Finding the Fourth Proportional to 83.15, 124.52 and 42.60

Step by Step Solution

1. Step 1: Write the proportion equation
   83.15 : 124.52 = 42.60 : x
2. Step 2: Convert to fraction form
   83.15/124.52 = 42.60/x
3. Step 3: Cross multiply
   83.15x = 124.52 × 42.60
4. Step 4: Simplify right side
   83.15x = 5,304.34
5. Step 5: Solve for x
   x = 5,304.34/83.15
6. Step 6: Final answer
   x = 63.80