Finding the Fourth Proportional to 20,499.37, 28,287.70 and 12,114.25

Step by Step Solution

1. Step 1: Write the proportion equation
   20,499.37 : 28,287.70 = 12,114.25 : x
2. Step 2: Convert to fraction form
   20,499.37/28,287.70 = 12,114.25/x
3. Step 3: Cross multiply
   20,499.37x = 28,287.70 × 12,114.25
4. Step 4: Simplify right side
   20,499.37x = 342,684,269.73
5. Step 5: Solve for x
   x = 342,684,269.73/20,499.37
6. Step 6: Final answer
   x = 16,716.82