Finding the Fourth Proportional to 18,685.39, 25,785.82 and 10,728.10

Step by Step Solution

1. Step 1: Write the proportion equation
   18,685.39 : 25,785.82 = 10,728.10 : x
2. Step 2: Convert to fraction form
   18,685.39/25,785.82 = 10,728.10/x
3. Step 3: Cross multiply
   18,685.39x = 25,785.82 × 10,728.10
4. Step 4: Simplify right side
   18,685.39x = 276,632,855.54
5. Step 5: Solve for x
   x = 276,632,855.54/18,685.39
6. Step 6: Final answer
   x = 14,804.77