Finding the Fourth Proportional to 16,681.98, 23,021.15 and 9,128.19

Step by Step Solution

1. Step 1: Write the proportion equation
   16,681.98 : 23,021.15 = 9,128.19 : x
2. Step 2: Convert to fraction form
   16,681.98/23,021.15 = 9,128.19/x
3. Step 3: Cross multiply
   16,681.98x = 23,021.15 × 9,128.19
4. Step 4: Simplify right side
   16,681.98x = 210,141,385.58
5. Step 5: Solve for x
   x = 210,141,385.58/16,681.98
6. Step 6: Final answer
   x = 12,596.91