Finding the Fourth Proportional to 12,843, 19,256.16 and 8,447.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,843 : 19,256.16 = 8,447.12 : x
2. Step 2: Convert to fraction form
   12,843/19,256.16 = 8,447.12/x
3. Step 3: Cross multiply
   12,843x = 19,256.16 × 8,447.12
4. Step 4: Simplify right side
   12,843x = 162,659,094.26
5. Step 5: Solve for x
   x = 162,659,094.26/12,843
6. Step 6: Final answer
   x = 12,665.19