Finding the Fourth Proportional to 21,893.39, 30,213.99 and 13,392.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,893.39 : 30,213.99 = 13,392.83 : x
2. Step 2: Convert to fraction form
   21,893.39/30,213.99 = 13,392.83/x
3. Step 3: Cross multiply
   21,893.39x = 30,213.99 × 13,392.83
4. Step 4: Simplify right side
   21,893.39x = 404,650,831.69
5. Step 5: Solve for x
   x = 404,650,831.69/21,893.39
6. Step 6: Final answer
   x = 18,482.79