Finding the Fourth Proportional to 12,196.56, 16,828.92 and 7,721.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,196.56 : 16,828.92 = 7,721.04 : x
2. Step 2: Convert to fraction form
   12,196.56/16,828.92 = 7,721.04/x
3. Step 3: Cross multiply
   12,196.56x = 16,828.92 × 7,721.04
4. Step 4: Simplify right side
   12,196.56x = 129,936,764.48
5. Step 5: Solve for x
   x = 129,936,764.48/12,196.56
6. Step 6: Final answer
   x = 10,653.56