Finding the Fourth Proportional to 83.20, 124.72 and 57.52

Step by Step Solution

1. Step 1: Write the proportion equation
   83.20 : 124.72 = 57.52 : x
2. Step 2: Convert to fraction form
   83.20/124.72 = 57.52/x
3. Step 3: Cross multiply
   83.20x = 124.72 × 57.52
4. Step 4: Simplify right side
   83.20x = 7,173.89
5. Step 5: Solve for x
   x = 7,173.89/83.20
6. Step 6: Final answer
   x = 86.22