Finding the Fourth Proportional to 2,640.38, 3,643.83 and 1,445.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.38 : 3,643.83 = 1,445.43 : x
2. Step 2: Convert to fraction form
   2,640.38/3,643.83 = 1,445.43/x
3. Step 3: Cross multiply
   2,640.38x = 3,643.83 × 1,445.43
4. Step 4: Simplify right side
   2,640.38x = 5,266,901.20
5. Step 5: Solve for x
   x = 5,266,901.20/2,640.38
6. Step 6: Final answer
   x = 1,994.75