Finding the Fourth Proportional to 82.21, 123.15 and 61.94

Step by Step Solution

1. Step 1: Write the proportion equation
   82.21 : 123.15 = 61.94 : x
2. Step 2: Convert to fraction form
   82.21/123.15 = 61.94/x
3. Step 3: Cross multiply
   82.21x = 123.15 × 61.94
4. Step 4: Simplify right side
   82.21x = 7,628.45
5. Step 5: Solve for x
   x = 7,628.45/82.21
6. Step 6: Final answer
   x = 92.79