Finding the Fourth Proportional to 82.14, 123.24 and 53.31

Step by Step Solution

1. Step 1: Write the proportion equation
   82.14 : 123.24 = 53.31 : x
2. Step 2: Convert to fraction form
   82.14/123.24 = 53.31/x
3. Step 3: Cross multiply
   82.14x = 123.24 × 53.31
4. Step 4: Simplify right side
   82.14x = 6,569.92
5. Step 5: Solve for x
   x = 6,569.92/82.14
6. Step 6: Final answer
   x = 79.98