Finding the Fourth Proportional to 16,696.54, 23,040.98 and 9,142.78

Step by Step Solution

1. Step 1: Write the proportion equation
   16,696.54 : 23,040.98 = 9,142.78 : x
2. Step 2: Convert to fraction form
   16,696.54/23,040.98 = 9,142.78/x
3. Step 3: Cross multiply
   16,696.54x = 23,040.98 × 9,142.78
4. Step 4: Simplify right side
   16,696.54x = 210,658,611.12
5. Step 5: Solve for x
   x = 210,658,611.12/16,696.54
6. Step 6: Final answer
   x = 12,616.90