Finding the Fourth Proportional to 82.52, 113.82 and 66.18

Step by Step Solution

1. Step 1: Write the proportion equation
   82.52 : 113.82 = 66.18 : x
2. Step 2: Convert to fraction form
   82.52/113.82 = 66.18/x
3. Step 3: Cross multiply
   82.52x = 113.82 × 66.18
4. Step 4: Simplify right side
   82.52x = 7,532.83
5. Step 5: Solve for x
   x = 7,532.83/82.52
6. Step 6: Final answer
   x = 91.29