Finding the Fourth Proportional to 30,902.52, 42,622.82 and 20,288.28

Step by Step Solution

1. Step 1: Write the proportion equation
   30,902.52 : 42,622.82 = 20,288.28 : x
2. Step 2: Convert to fraction form
   30,902.52/42,622.82 = 20,288.28/x
3. Step 3: Cross multiply
   30,902.52x = 42,622.82 × 20,288.28
4. Step 4: Simplify right side
   30,902.52x = 864,743,706.55
5. Step 5: Solve for x
   x = 864,743,706.55/30,902.52
6. Step 6: Final answer
   x = 27,982.95