Finding the Fourth Proportional to 18,968.58, 28,443.15 and 12,028.50

Step by Step Solution

1. Step 1: Write the proportion equation
   18,968.58 : 28,443.15 = 12,028.50 : x
2. Step 2: Convert to fraction form
   18,968.58/28,443.15 = 12,028.50/x
3. Step 3: Cross multiply
   18,968.58x = 28,443.15 × 12,028.50
4. Step 4: Simplify right side
   18,968.58x = 342,128,429.78
5. Step 5: Solve for x
   x = 342,128,429.78/18,968.58
6. Step 6: Final answer
   x = 18,036.59