Finding the Fourth Proportional to 11,238.74, 16,844.89 and 8,456.39

Step by Step Solution

1. Step 1: Write the proportion equation
   11,238.74 : 16,844.89 = 8,456.39 : x
2. Step 2: Convert to fraction form
   11,238.74/16,844.89 = 8,456.39/x
3. Step 3: Cross multiply
   11,238.74x = 16,844.89 × 8,456.39
4. Step 4: Simplify right side
   11,238.74x = 142,446,959.35
5. Step 5: Solve for x
   x = 142,446,959.35/11,238.74
6. Step 6: Final answer
   x = 12,674.64