Finding the Fourth Proportional to 20,109, 27,751.86 and 11,158.20

Step by Step Solution

1. Step 1: Write the proportion equation
   20,109 : 27,751.86 = 11,158.20 : x
2. Step 2: Convert to fraction form
   20,109/27,751.86 = 11,158.20/x
3. Step 3: Cross multiply
   20,109x = 27,751.86 × 11,158.20
4. Step 4: Simplify right side
   20,109x = 309,660,804.25
5. Step 5: Solve for x
   x = 309,660,804.25/20,109
6. Step 6: Final answer
   x = 15,399.12