Finding the Fourth Proportional to 20,978.33, 28,949.23 and 12,019.62

Step by Step Solution

1. Step 1: Write the proportion equation
   20,978.33 : 28,949.23 = 12,019.62 : x
2. Step 2: Convert to fraction form
   20,978.33/28,949.23 = 12,019.62/x
3. Step 3: Cross multiply
   20,978.33x = 28,949.23 × 12,019.62
4. Step 4: Simplify right side
   20,978.33x = 347,958,867.48
5. Step 5: Solve for x
   x = 347,958,867.48/20,978.33
6. Step 6: Final answer
   x = 16,586.59