Finding the Fourth Proportional to 2,161.42, 2,979.33 and 1,636.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,161.42 : 2,979.33 = 1,636.54 : x
2. Step 2: Convert to fraction form
   2,161.42/2,979.33 = 1,636.54/x
3. Step 3: Cross multiply
   2,161.42x = 2,979.33 × 1,636.54
4. Step 4: Simplify right side
   2,161.42x = 4,875,792.72
5. Step 5: Solve for x
   x = 4,875,792.72/2,161.42
6. Step 6: Final answer
   x = 2,255.83