Finding the Fourth Proportional to 82.70, 123.82 and 65.61

Step by Step Solution

1. Step 1: Write the proportion equation
   82.70 : 123.82 = 65.61 : x
2. Step 2: Convert to fraction form
   82.70/123.82 = 65.61/x
3. Step 3: Cross multiply
   82.70x = 123.82 × 65.61
4. Step 4: Simplify right side
   82.70x = 8,123.83
5. Step 5: Solve for x
   x = 8,123.83/82.70
6. Step 6: Final answer
   x = 98.23