Finding the Fourth Proportional to 13,947.72, 19,224.72 and 13,578.36

Step by Step Solution

1. Step 1: Write the proportion equation
   13,947.72 : 19,224.72 = 13,578.36 : x
2. Step 2: Convert to fraction form
   13,947.72/19,224.72 = 13,578.36/x
3. Step 3: Cross multiply
   13,947.72x = 19,224.72 × 13,578.36
4. Step 4: Simplify right side
   13,947.72x = 261,040,169.06
5. Step 5: Solve for x
   x = 261,040,169.06/13,947.72
6. Step 6: Final answer
   x = 18,715.62