Finding the Fourth Proportional to 21,996.88, 30,356.88 and 12,567.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,996.88 : 30,356.88 = 12,567.28 : x
2. Step 2: Convert to fraction form
   21,996.88/30,356.88 = 12,567.28/x
3. Step 3: Cross multiply
   21,996.88x = 30,356.88 × 12,567.28
4. Step 4: Simplify right side
   21,996.88x = 381,503,410.89
5. Step 5: Solve for x
   x = 381,503,410.89/21,996.88
6. Step 6: Final answer
   x = 17,343.52