Finding the Fourth Proportional to 20,496.89, 28,080.83 and 19,728.99

Step by Step Solution

1. Step 1: Write the proportion equation
   20,496.89 : 28,080.83 = 19,728.99 : x
2. Step 2: Convert to fraction form
   20,496.89/28,080.83 = 19,728.99/x
3. Step 3: Cross multiply
   20,496.89x = 28,080.83 × 19,728.99
4. Step 4: Simplify right side
   20,496.89x = 554,006,315.62
5. Step 5: Solve for x
   x = 554,006,315.62/20,496.89
6. Step 6: Final answer
   x = 27,028.81