Finding the Fourth Proportional to 21,798.88, 30,081.72 and 12,238.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,798.88 : 30,081.72 = 12,238.72 : x
2. Step 2: Convert to fraction form
   21,798.88/30,081.72 = 12,238.72/x
3. Step 3: Cross multiply
   21,798.88x = 30,081.72 × 12,238.72
4. Step 4: Simplify right side
   21,798.88x = 368,161,748.20
5. Step 5: Solve for x
   x = 368,161,748.20/21,798.88
6. Step 6: Final answer
   x = 16,889.02