Finding the Fourth Proportional to 2,636.28, 3,638.16 and 1,641.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,636.28 : 3,638.16 = 1,641.60 : x
2. Step 2: Convert to fraction form
   2,636.28/3,638.16 = 1,641.60/x
3. Step 3: Cross multiply
   2,636.28x = 3,638.16 × 1,641.60
4. Step 4: Simplify right side
   2,636.28x = 5,972,403.46
5. Step 5: Solve for x
   x = 5,972,403.46/2,636.28
6. Step 6: Final answer
   x = 2,265.47