Finding the Fourth Proportional to 18,857.86, 26,019.98 and 12,142.56

Step by Step Solution

1. Step 1: Write the proportion equation
   18,857.86 : 26,019.98 = 12,142.56 : x
2. Step 2: Convert to fraction form
   18,857.86/26,019.98 = 12,142.56/x
3. Step 3: Cross multiply
   18,857.86x = 26,019.98 × 12,142.56
4. Step 4: Simplify right side
   18,857.86x = 315,949,172.69
5. Step 5: Solve for x
   x = 315,949,172.69/18,857.86
6. Step 6: Final answer
   x = 16,754.24