Finding the Fourth Proportional to 2,640.85, 3,644.30 and 1,445.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.85 : 3,644.30 = 1,445.83 : x
2. Step 2: Convert to fraction form
   2,640.85/3,644.30 = 1,445.83/x
3. Step 3: Cross multiply
   2,640.85x = 3,644.30 × 1,445.83
4. Step 4: Simplify right side
   2,640.85x = 5,269,032.77
5. Step 5: Solve for x
   x = 5,269,032.77/2,640.85
6. Step 6: Final answer
   x = 1,995.21