Finding the Fourth Proportional to 21,738.18, 30,003.35 and 13,243.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,738.18 : 30,003.35 = 13,243.06 : x
2. Step 2: Convert to fraction form
   21,738.18/30,003.35 = 13,243.06/x
3. Step 3: Cross multiply
   21,738.18x = 30,003.35 × 13,243.06
4. Step 4: Simplify right side
   21,738.18x = 397,336,164.25
5. Step 5: Solve for x
   x = 397,336,164.25/21,738.18
6. Step 6: Final answer
   x = 18,278.26