Finding the Fourth Proportional to 12,843.42, 17,723.79 and 8,131.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,843.42 : 17,723.79 = 8,131.56 : x
2. Step 2: Convert to fraction form
   12,843.42/17,723.79 = 8,131.56/x
3. Step 3: Cross multiply
   12,843.42x = 17,723.79 × 8,131.56
4. Step 4: Simplify right side
   12,843.42x = 144,122,061.81
5. Step 5: Solve for x
   x = 144,122,061.81/12,843.42
6. Step 6: Final answer
   x = 11,221.47