Finding the Fourth Proportional to 83.81, 125.71 and 38.10

Step by Step Solution

1. Step 1: Write the proportion equation
   83.81 : 125.71 = 38.10 : x
2. Step 2: Convert to fraction form
   83.81/125.71 = 38.10/x
3. Step 3: Cross multiply
   83.81x = 125.71 × 38.10
4. Step 4: Simplify right side
   83.81x = 4,789.55
5. Step 5: Solve for x
   x = 4,789.55/83.81
6. Step 6: Final answer
   x = 57.15