Finding the Fourth Proportional to 12,399.82, 18,599.83 and 4,080.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.82 : 18,599.83 = 4,080.40 : x
2. Step 2: Convert to fraction form
   12,399.82/18,599.83 = 4,080.40/x
3. Step 3: Cross multiply
   12,399.82x = 18,599.83 × 4,080.40
4. Step 4: Simplify right side
   12,399.82x = 75,894,746.33
5. Step 5: Solve for x
   x = 75,894,746.33/12,399.82
6. Step 6: Final answer
   x = 6,120.63