Finding the Fourth Proportional to 2,185.54, 3,273.99 and 1,638.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.54 : 3,273.99 = 1,638.34 : x
2. Step 2: Convert to fraction form
   2,185.54/3,273.99 = 1,638.34/x
3. Step 3: Cross multiply
   2,185.54x = 3,273.99 × 1,638.34
4. Step 4: Simplify right side
   2,185.54x = 5,363,908.78
5. Step 5: Solve for x
   x = 5,363,908.78/2,185.54
6. Step 6: Final answer
   x = 2,454.27