Finding the Fourth Proportional to 21,758.38, 30,021.42 and 12,806.26

Step by Step Solution

1. Step 1: Write the proportion equation
   21,758.38 : 30,021.42 = 12,806.26 : x
2. Step 2: Convert to fraction form
   21,758.38/30,021.42 = 12,806.26/x
3. Step 3: Cross multiply
   21,758.38x = 30,021.42 × 12,806.26
4. Step 4: Simplify right side
   21,758.38x = 384,462,110.09
5. Step 5: Solve for x
   x = 384,462,110.09/21,758.38
6. Step 6: Final answer
   x = 17,669.61