Finding the Fourth Proportional to 2,640.98, 3,645.27 and 1,645.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.98 : 3,645.27 = 1,645.65 : x
2. Step 2: Convert to fraction form
   2,640.98/3,645.27 = 1,645.65/x
3. Step 3: Cross multiply
   2,640.98x = 3,645.27 × 1,645.65
4. Step 4: Simplify right side
   2,640.98x = 5,998,838.58
5. Step 5: Solve for x
   x = 5,998,838.58/2,640.98
6. Step 6: Final answer
   x = 2,271.44