Finding the Fourth Proportional to 3,643.63, 5,456.59 and 2,078.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,643.63 : 5,456.59 = 2,078.91 : x
2. Step 2: Convert to fraction form
   3,643.63/5,456.59 = 2,078.91/x
3. Step 3: Cross multiply
   3,643.63x = 5,456.59 × 2,078.91
4. Step 4: Simplify right side
   3,643.63x = 11,343,759.52
5. Step 5: Solve for x
   x = 11,343,759.52/3,643.63
6. Step 6: Final answer
   x = 3,113.31