Finding the Fourth Proportional to 21,892.39, 30,212.61 and 13,391.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,892.39 : 30,212.61 = 13,391.83 : x
2. Step 2: Convert to fraction form
   21,892.39/30,212.61 = 13,391.83/x
3. Step 3: Cross multiply
   21,892.39x = 30,212.61 × 13,391.83
4. Step 4: Simplify right side
   21,892.39x = 404,602,136.98
5. Step 5: Solve for x
   x = 404,602,136.98/21,892.39
6. Step 6: Final answer
   x = 18,481.41