Finding the Fourth Proportional to 21,144.61, 29,193 and 13,198.51

Step by Step Solution

1. Step 1: Write the proportion equation
   21,144.61 : 29,193 = 13,198.51 : x
2. Step 2: Convert to fraction form
   21,144.61/29,193 = 13,198.51/x
3. Step 3: Cross multiply
   21,144.61x = 29,193 × 13,198.51
4. Step 4: Simplify right side
   21,144.61x = 385,303,956.47
5. Step 5: Solve for x
   x = 385,303,956.47/21,144.61
6. Step 6: Final answer
   x = 18,222.33