Finding the Fourth Proportional to 82.09, 123.18 and 53.25

Step by Step Solution

1. Step 1: Write the proportion equation
   82.09 : 123.18 = 53.25 : x
2. Step 2: Convert to fraction form
   82.09/123.18 = 53.25/x
3. Step 3: Cross multiply
   82.09x = 123.18 × 53.25
4. Step 4: Simplify right side
   82.09x = 6,559.34
5. Step 5: Solve for x
   x = 6,559.34/82.09
6. Step 6: Final answer
   x = 79.90