Finding the Fourth Proportional to 82.21, 123.17 and 73.10

Step by Step Solution

1. Step 1: Write the proportion equation
   82.21 : 123.17 = 73.10 : x
2. Step 2: Convert to fraction form
   82.21/123.17 = 73.10/x
3. Step 3: Cross multiply
   82.21x = 123.17 × 73.10
4. Step 4: Simplify right side
   82.21x = 9,003.73
5. Step 5: Solve for x
   x = 9,003.73/82.21
6. Step 6: Final answer
   x = 109.52