Finding the Fourth Proportional to 16,681.72, 23,021.64 and 9,511.86

Step by Step Solution

1. Step 1: Write the proportion equation
   16,681.72 : 23,021.64 = 9,511.86 : x
2. Step 2: Convert to fraction form
   16,681.72/23,021.64 = 9,511.86/x
3. Step 3: Cross multiply
   16,681.72x = 23,021.64 × 9,511.86
4. Step 4: Simplify right side
   16,681.72x = 218,978,616.65
5. Step 5: Solve for x
   x = 218,978,616.65/16,681.72
6. Step 6: Final answer
   x = 13,126.86