Finding the Fourth Proportional to 2,160.41, 2,979.72 and 1,809.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.41 : 2,979.72 = 1,809.54 : x
2. Step 2: Convert to fraction form
   2,160.41/2,979.72 = 1,809.54/x
3. Step 3: Cross multiply
   2,160.41x = 2,979.72 × 1,809.54
4. Step 4: Simplify right side
   2,160.41x = 5,391,922.53
5. Step 5: Solve for x
   x = 5,391,922.53/2,160.41
6. Step 6: Final answer
   x = 2,495.79