Finding the Fourth Proportional to 15,853.25, 21,872.52 and 9,137.96

Step by Step Solution

1. Step 1: Write the proportion equation
   15,853.25 : 21,872.52 = 9,137.96 : x
2. Step 2: Convert to fraction form
   15,853.25/21,872.52 = 9,137.96/x
3. Step 3: Cross multiply
   15,853.25x = 21,872.52 × 9,137.96
4. Step 4: Simplify right side
   15,853.25x = 199,870,103.50
5. Step 5: Solve for x
   x = 199,870,103.50/15,853.25
6. Step 6: Final answer
   x = 12,607.52