Finding the Fourth Proportional to 2,159.51, 2,979.91 and 1,215.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.51 : 2,979.91 = 1,215.18 : x
2. Step 2: Convert to fraction form
   2,159.51/2,979.91 = 1,215.18/x
3. Step 3: Cross multiply
   2,159.51x = 2,979.91 × 1,215.18
4. Step 4: Simplify right side
   2,159.51x = 3,621,123.59
5. Step 5: Solve for x
   x = 3,621,123.59/2,159.51
6. Step 6: Final answer
   x = 1,676.83