Finding the Fourth Proportional to 40,479.30, 60,723 and 12,399.03

Step by Step Solution

1. Step 1: Write the proportion equation
   40,479.30 : 60,723 = 12,399.03 : x
2. Step 2: Convert to fraction form
   40,479.30/60,723 = 12,399.03/x
3. Step 3: Cross multiply
   40,479.30x = 60,723 × 12,399.03
4. Step 4: Simplify right side
   40,479.30x = 752,906,298.69
5. Step 5: Solve for x
   x = 752,906,298.69/40,479.30
6. Step 6: Final answer
   x = 18,599.79