Finding the Fourth Proportional to 21,843.33, 30,143.79 and 12,411.90

Step by Step Solution

1. Step 1: Write the proportion equation
   21,843.33 : 30,143.79 = 12,411.90 : x
2. Step 2: Convert to fraction form
   21,843.33/30,143.79 = 12,411.90/x
3. Step 3: Cross multiply
   21,843.33x = 30,143.79 × 12,411.90
4. Step 4: Simplify right side
   21,843.33x = 374,141,707.10
5. Step 5: Solve for x
   x = 374,141,707.10/21,843.33
6. Step 6: Final answer
   x = 17,128.42