Finding the Fourth Proportional to 20,399.04, 30,603.42 and 7,919.37

Step by Step Solution

1. Step 1: Write the proportion equation
   20,399.04 : 30,603.42 = 7,919.37 : x
2. Step 2: Convert to fraction form
   20,399.04/30,603.42 = 7,919.37/x
3. Step 3: Cross multiply
   20,399.04x = 30,603.42 × 7,919.37
4. Step 4: Simplify right side
   20,399.04x = 242,359,806.25
5. Step 5: Solve for x
   x = 242,359,806.25/20,399.04
6. Step 6: Final answer
   x = 11,880.94