Finding the Fourth Proportional to 80.83, 111.56 and 53.20

Step by Step Solution

1. Step 1: Write the proportion equation
   80.83 : 111.56 = 53.20 : x
2. Step 2: Convert to fraction form
   80.83/111.56 = 53.20/x
3. Step 3: Cross multiply
   80.83x = 111.56 × 53.20
4. Step 4: Simplify right side
   80.83x = 5,935.55
5. Step 5: Solve for x
   x = 5,935.55/80.83
6. Step 6: Final answer
   x = 73.43