Finding the Fourth Proportional to 2,186.54, 3,275.49 and 1,639.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,186.54 : 3,275.49 = 1,639.34 : x
2. Step 2: Convert to fraction form
   2,186.54/3,275.49 = 1,639.34/x
3. Step 3: Cross multiply
   2,186.54x = 3,275.49 × 1,639.34
4. Step 4: Simplify right side
   2,186.54x = 5,369,641.78
5. Step 5: Solve for x
   x = 5,369,641.78/2,186.54
6. Step 6: Final answer
   x = 2,455.77