Finding the Fourth Proportional to 21,901.54, 30,213.30 and 12,944.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,901.54 : 30,213.30 = 12,944.72 : x
2. Step 2: Convert to fraction form
   21,901.54/30,213.30 = 12,944.72/x
3. Step 3: Cross multiply
   21,901.54x = 30,213.30 × 12,944.72
4. Step 4: Simplify right side
   21,901.54x = 391,102,708.78
5. Step 5: Solve for x
   x = 391,102,708.78/21,901.54
6. Step 6: Final answer
   x = 17,857.32