Finding the Fourth Proportional to 12,403.40, 18,604.49 and 5,379.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,403.40 : 18,604.49 = 5,379.89 : x
2. Step 2: Convert to fraction form
   12,403.40/18,604.49 = 5,379.89/x
3. Step 3: Cross multiply
   12,403.40x = 18,604.49 × 5,379.89
4. Step 4: Simplify right side
   12,403.40x = 100,089,989.78
5. Step 5: Solve for x
   x = 100,089,989.78/12,403.40
6. Step 6: Final answer
   x = 8,069.56