Finding the Fourth Proportional to 83.57, 125.28 and 42.94

Step by Step Solution

1. Step 1: Write the proportion equation
   83.57 : 125.28 = 42.94 : x
2. Step 2: Convert to fraction form
   83.57/125.28 = 42.94/x
3. Step 3: Cross multiply
   83.57x = 125.28 × 42.94
4. Step 4: Simplify right side
   83.57x = 5,379.52
5. Step 5: Solve for x
   x = 5,379.52/83.57
6. Step 6: Final answer
   x = 64.37