Finding the Fourth Proportional to 2,256.94, 3,386.22 and 1,639.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,256.94 : 3,386.22 = 1,639.60 : x
2. Step 2: Convert to fraction form
   2,256.94/3,386.22 = 1,639.60/x
3. Step 3: Cross multiply
   2,256.94x = 3,386.22 × 1,639.60
4. Step 4: Simplify right side
   2,256.94x = 5,552,046.31
5. Step 5: Solve for x
   x = 5,552,046.31/2,256.94
6. Step 6: Final answer
   x = 2,459.99