Finding the Fourth Proportional to 2,159.46, 2,979.81 and 1,215.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.46 : 2,979.81 = 1,215.18 : x
2. Step 2: Convert to fraction form
   2,159.46/2,979.81 = 1,215.18/x
3. Step 3: Cross multiply
   2,159.46x = 2,979.81 × 1,215.18
4. Step 4: Simplify right side
   2,159.46x = 3,621,005.52
5. Step 5: Solve for x
   x = 3,621,005.52/2,159.46
6. Step 6: Final answer
   x = 1,676.81