Finding the Fourth Proportional to 12,667.24, 18,993.57 and 3,899.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,667.24 : 18,993.57 = 3,899.80 : x
2. Step 2: Convert to fraction form
   12,667.24/18,993.57 = 3,899.80/x
3. Step 3: Cross multiply
   12,667.24x = 18,993.57 × 3,899.80
4. Step 4: Simplify right side
   12,667.24x = 74,071,124.29
5. Step 5: Solve for x
   x = 74,071,124.29/12,667.24
6. Step 6: Final answer
   x = 5,847.46