Finding the Fourth Proportional to 21,982.56, 30,348.18 and 20,648.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,982.56 : 30,348.18 = 20,648.49 : x
2. Step 2: Convert to fraction form
   21,982.56/30,348.18 = 20,648.49/x
3. Step 3: Cross multiply
   21,982.56x = 30,348.18 × 20,648.49
4. Step 4: Simplify right side
   21,982.56x = 626,644,091.25
5. Step 5: Solve for x
   x = 626,644,091.25/21,982.56
6. Step 6: Final answer
   x = 28,506.42