Finding the Fourth Proportional to 82.22, 123.29 and 28.10

Step by Step Solution

1. Step 1: Write the proportion equation
   82.22 : 123.29 = 28.10 : x
2. Step 2: Convert to fraction form
   82.22/123.29 = 28.10/x
3. Step 3: Cross multiply
   82.22x = 123.29 × 28.10
4. Step 4: Simplify right side
   82.22x = 3,463.69
5. Step 5: Solve for x
   x = 3,463.69/82.22
6. Step 6: Final answer
   x = 42.13