Finding the Fourth Proportional to 21,798.54, 30,081.54 and 12,238.65

Step by Step Solution

1. Step 1: Write the proportion equation
   21,798.54 : 30,081.54 = 12,238.65 : x
2. Step 2: Convert to fraction form
   21,798.54/30,081.54 = 12,238.65/x
3. Step 3: Cross multiply
   21,798.54x = 30,081.54 × 12,238.65
4. Step 4: Simplify right side
   21,798.54x = 368,157,439.52
5. Step 5: Solve for x
   x = 368,157,439.52/21,798.54
6. Step 6: Final answer
   x = 16,889.09