Finding the Fourth Proportional to 12,196.98, 16,839.60 and 9,964.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,196.98 : 16,839.60 = 9,964.20 : x
2. Step 2: Convert to fraction form
   12,196.98/16,839.60 = 9,964.20/x
3. Step 3: Cross multiply
   12,196.98x = 16,839.60 × 9,964.20
4. Step 4: Simplify right side
   12,196.98x = 167,793,142.32
5. Step 5: Solve for x
   x = 167,793,142.32/12,196.98
6. Step 6: Final answer
   x = 13,756.94