Finding the Fourth Proportional to 82.29, 123.42 and 28.16

Step by Step Solution

1. Step 1: Write the proportion equation
   82.29 : 123.42 = 28.16 : x
2. Step 2: Convert to fraction form
   82.29/123.42 = 28.16/x
3. Step 3: Cross multiply
   82.29x = 123.42 × 28.16
4. Step 4: Simplify right side
   82.29x = 3,475.51
5. Step 5: Solve for x
   x = 3,475.51/82.29
6. Step 6: Final answer
   x = 42.23