Finding the Fourth Proportional to 82.47, 123.71 and 28.35

Step by Step Solution

1. Step 1: Write the proportion equation
   82.47 : 123.71 = 28.35 : x
2. Step 2: Convert to fraction form
   82.47/123.71 = 28.35/x
3. Step 3: Cross multiply
   82.47x = 123.71 × 28.35
4. Step 4: Simplify right side
   82.47x = 3,507.04
5. Step 5: Solve for x
   x = 3,507.04/82.47
6. Step 6: Final answer
   x = 42.53