Finding the Fourth Proportional to 3,679.63, 5,078.40 and 2,107.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,679.63 : 5,078.40 = 2,107.72 : x
2. Step 2: Convert to fraction form
   3,679.63/5,078.40 = 2,107.72/x
3. Step 3: Cross multiply
   3,679.63x = 5,078.40 × 2,107.72
4. Step 4: Simplify right side
   3,679.63x = 10,703,843.69
5. Step 5: Solve for x
   x = 10,703,843.69/3,679.63
6. Step 6: Final answer
   x = 2,908.95