Finding the Fourth Proportional to 2,640.90, 3,648.06 and 2,059.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.90 : 3,648.06 = 2,059.05 : x
2. Step 2: Convert to fraction form
   2,640.90/3,648.06 = 2,059.05/x
3. Step 3: Cross multiply
   2,640.90x = 3,648.06 × 2,059.05
4. Step 4: Simplify right side
   2,640.90x = 7,511,537.94
5. Step 5: Solve for x
   x = 7,511,537.94/2,640.90
6. Step 6: Final answer
   x = 2,844.31