Finding the Fourth Proportional to 13,109.76, 19,665.24 and 8,676.21

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.76 : 19,665.24 = 8,676.21 : x
2. Step 2: Convert to fraction form
   13,109.76/19,665.24 = 8,676.21/x
3. Step 3: Cross multiply
   13,109.76x = 19,665.24 × 8,676.21
4. Step 4: Simplify right side
   13,109.76x = 170,619,751.94
5. Step 5: Solve for x
   x = 170,619,751.94/13,109.76
6. Step 6: Final answer
   x = 13,014.71