Finding the Fourth Proportional to 3,997.09, 5,515.89 and 2,318.79

Step by Step Solution

1. Step 1: Write the proportion equation
   3,997.09 : 5,515.89 = 2,318.79 : x
2. Step 2: Convert to fraction form
   3,997.09/5,515.89 = 2,318.79/x
3. Step 3: Cross multiply
   3,997.09x = 5,515.89 × 2,318.79
4. Step 4: Simplify right side
   3,997.09x = 12,790,190.57
5. Step 5: Solve for x
   x = 12,790,190.57/3,997.09
6. Step 6: Final answer
   x = 3,199.88