Finding the Fourth Proportional to 19,105.78, 28,659.59 and 8,012.83

Step by Step Solution

1. Step 1: Write the proportion equation
   19,105.78 : 28,659.59 = 8,012.83 : x
2. Step 2: Convert to fraction form
   19,105.78/28,659.59 = 8,012.83/x
3. Step 3: Cross multiply
   19,105.78x = 28,659.59 × 8,012.83
4. Step 4: Simplify right side
   19,105.78x = 229,644,422.54
5. Step 5: Solve for x
   x = 229,644,422.54/19,105.78
6. Step 6: Final answer
   x = 12,019.63