Finding the Fourth Proportional to 20,469.93, 28,245.15 and 13,766.78

Step by Step Solution

1. Step 1: Write the proportion equation
   20,469.93 : 28,245.15 = 13,766.78 : x
2. Step 2: Convert to fraction form
   20,469.93/28,245.15 = 13,766.78/x
3. Step 3: Cross multiply
   20,469.93x = 28,245.15 × 13,766.78
4. Step 4: Simplify right side
   20,469.93x = 388,844,624.89
5. Step 5: Solve for x
   x = 388,844,624.89/20,469.93
6. Step 6: Final answer
   x = 18,995.89