Finding the Fourth Proportional to 80.83, 111.50 and 53.15

Step by Step Solution

1. Step 1: Write the proportion equation
   80.83 : 111.50 = 53.15 : x
2. Step 2: Convert to fraction form
   80.83/111.50 = 53.15/x
3. Step 3: Cross multiply
   80.83x = 111.50 × 53.15
4. Step 4: Simplify right side
   80.83x = 5,925.96
5. Step 5: Solve for x
   x = 5,925.96/80.83
6. Step 6: Final answer
   x = 73.32