Finding the Fourth Proportional to 16,796.74, 23,180.28 and 9,721.80

Step by Step Solution

1. Step 1: Write the proportion equation
   16,796.74 : 23,180.28 = 9,721.80 : x
2. Step 2: Convert to fraction form
   16,796.74/23,180.28 = 9,721.80/x
3. Step 3: Cross multiply
   16,796.74x = 23,180.28 × 9,721.80
4. Step 4: Simplify right side
   16,796.74x = 225,354,046.10
5. Step 5: Solve for x
   x = 225,354,046.10/16,796.74
6. Step 6: Final answer
   x = 13,416.53