Finding the Fourth Proportional to 83.55, 125.42 and 42.96

Step by Step Solution

1. Step 1: Write the proportion equation
   83.55 : 125.42 = 42.96 : x
2. Step 2: Convert to fraction form
   83.55/125.42 = 42.96/x
3. Step 3: Cross multiply
   83.55x = 125.42 × 42.96
4. Step 4: Simplify right side
   83.55x = 5,388.04
5. Step 5: Solve for x
   x = 5,388.04/83.55
6. Step 6: Final answer
   x = 64.49