Finding the Fourth Proportional to 15,745.89, 21,730.56 and 8,673.57

Step by Step Solution

1. Step 1: Write the proportion equation
   15,745.89 : 21,730.56 = 8,673.57 : x
2. Step 2: Convert to fraction form
   15,745.89/21,730.56 = 8,673.57/x
3. Step 3: Cross multiply
   15,745.89x = 21,730.56 × 8,673.57
4. Step 4: Simplify right side
   15,745.89x = 188,481,533.30
5. Step 5: Solve for x
   x = 188,481,533.30/15,745.89
6. Step 6: Final answer
   x = 11,970.21