Finding the Fourth Proportional to 3,196.79, 4,412.39 and 2,864.64

Step by Step Solution

1. Step 1: Write the proportion equation
   3,196.79 : 4,412.39 = 2,864.64 : x
2. Step 2: Convert to fraction form
   3,196.79/4,412.39 = 2,864.64/x
3. Step 3: Cross multiply
   3,196.79x = 4,412.39 × 2,864.64
4. Step 4: Simplify right side
   3,196.79x = 12,639,908.89
5. Step 5: Solve for x
   x = 12,639,908.89/3,196.79
6. Step 6: Final answer
   x = 3,953.94