Finding the Fourth Proportional to 83.41, 125.18 and 42.86

Step by Step Solution

1. Step 1: Write the proportion equation
   83.41 : 125.18 = 42.86 : x
2. Step 2: Convert to fraction form
   83.41/125.18 = 42.86/x
3. Step 3: Cross multiply
   83.41x = 125.18 × 42.86
4. Step 4: Simplify right side
   83.41x = 5,365.21
5. Step 5: Solve for x
   x = 5,365.21/83.41
6. Step 6: Final answer
   x = 64.32