Finding the Fourth Proportional to 2,159.77, 2,979.72 and 1,215.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.77 : 2,979.72 = 1,215.41 : x
2. Step 2: Convert to fraction form
   2,159.77/2,979.72 = 1,215.41/x
3. Step 3: Cross multiply
   2,159.77x = 2,979.72 × 1,215.41
4. Step 4: Simplify right side
   2,159.77x = 3,621,569.63
5. Step 5: Solve for x
   x = 3,621,569.63/2,159.77
6. Step 6: Final answer
   x = 1,676.84