Finding the Fourth Proportional to 12,218.54, 18,328.83 and 3,899.73

Step by Step Solution

1. Step 1: Write the proportion equation
   12,218.54 : 18,328.83 = 3,899.73 : x
2. Step 2: Convert to fraction form
   12,218.54/18,328.83 = 3,899.73/x
3. Step 3: Cross multiply
   12,218.54x = 18,328.83 × 3,899.73
4. Step 4: Simplify right side
   12,218.54x = 71,477,488.22
5. Step 5: Solve for x
   x = 71,477,488.22/12,218.54
6. Step 6: Final answer
   x = 5,849.92