Finding the Fourth Proportional to 21,996.36, 30,353.40 and 12,564.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,996.36 : 30,353.40 = 12,564.72 : x
2. Step 2: Convert to fraction form
   21,996.36/30,353.40 = 12,564.72/x
3. Step 3: Cross multiply
   21,996.36x = 30,353.40 × 12,564.72
4. Step 4: Simplify right side
   21,996.36x = 381,381,972.05
5. Step 5: Solve for x
   x = 381,381,972.05/21,996.36
6. Step 6: Final answer
   x = 17,338.41