Finding the Fourth Proportional to 16,685.42, 23,031 and 9,616.55

Step by Step Solution

1. Step 1: Write the proportion equation
   16,685.42 : 23,031 = 9,616.55 : x
2. Step 2: Convert to fraction form
   16,685.42/23,031 = 9,616.55/x
3. Step 3: Cross multiply
   16,685.42x = 23,031 × 9,616.55
4. Step 4: Simplify right side
   16,685.42x = 221,478,647.90
5. Step 5: Solve for x
   x = 221,478,647.90/16,685.42
6. Step 6: Final answer
   x = 13,273.79