Finding the Fourth Proportional to 15,809.94, 21,818.15 and 8,736.82

Step by Step Solution

1. Step 1: Write the proportion equation
   15,809.94 : 21,818.15 = 8,736.82 : x
2. Step 2: Convert to fraction form
   15,809.94/21,818.15 = 8,736.82/x
3. Step 3: Cross multiply
   15,809.94x = 21,818.15 × 8,736.82
4. Step 4: Simplify right side
   15,809.94x = 190,621,249.28
5. Step 5: Solve for x
   x = 190,621,249.28/15,809.94
6. Step 6: Final answer
   x = 12,057.05