Finding the Fourth Proportional to 18,784.17, 25,880.42 and 12,399.39

Step by Step Solution

1. Step 1: Write the proportion equation
   18,784.17 : 25,880.42 = 12,399.39 : x
2. Step 2: Convert to fraction form
   18,784.17/25,880.42 = 12,399.39/x
3. Step 3: Cross multiply
   18,784.17x = 25,880.42 × 12,399.39
4. Step 4: Simplify right side
   18,784.17x = 320,901,451.94
5. Step 5: Solve for x
   x = 320,901,451.94/18,784.17
6. Step 6: Final answer
   x = 17,083.61