Finding the Fourth Proportional to 83.52, 125.20 and 42.91

Step by Step Solution

1. Step 1: Write the proportion equation
   83.52 : 125.20 = 42.91 : x
2. Step 2: Convert to fraction form
   83.52/125.20 = 42.91/x
3. Step 3: Cross multiply
   83.52x = 125.20 × 42.91
4. Step 4: Simplify right side
   83.52x = 5,372.33
5. Step 5: Solve for x
   x = 5,372.33/83.52
6. Step 6: Final answer
   x = 64.32