Finding the Fourth Proportional to 12,831, 17,638.87 and 11,031.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,831 : 17,638.87 = 11,031.83 : x
2. Step 2: Convert to fraction form
   12,831/17,638.87 = 11,031.83/x
3. Step 3: Cross multiply
   12,831x = 17,638.87 × 11,031.83
4. Step 4: Simplify right side
   12,831x = 194,589,015.23
5. Step 5: Solve for x
   x = 194,589,015.23/12,831
6. Step 6: Final answer
   x = 15,165.54