Finding the Fourth Proportional to 83.53, 125.13 and 42.89

Step by Step Solution

1. Step 1: Write the proportion equation
   83.53 : 125.13 = 42.89 : x
2. Step 2: Convert to fraction form
   83.53/125.13 = 42.89/x
3. Step 3: Cross multiply
   83.53x = 125.13 × 42.89
4. Step 4: Simplify right side
   83.53x = 5,366.83
5. Step 5: Solve for x
   x = 5,366.83/83.53
6. Step 6: Final answer
   x = 64.25