Finding the Fourth Proportional to 2,159.57, 2,979.92 and 1,215.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.57 : 2,979.92 = 1,215.33 : x
2. Step 2: Convert to fraction form
   2,159.57/2,979.92 = 1,215.33/x
3. Step 3: Cross multiply
   2,159.57x = 2,979.92 × 1,215.33
4. Step 4: Simplify right side
   2,159.57x = 3,621,578.04
5. Step 5: Solve for x
   x = 3,621,578.04/2,159.57
6. Step 6: Final answer
   x = 1,676.99