Finding the Fourth Proportional to 3,681.60, 5,080.59 and 2,109.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,681.60 : 5,080.59 = 2,109.69 : x
2. Step 2: Convert to fraction form
   3,681.60/5,080.59 = 2,109.69/x
3. Step 3: Cross multiply
   3,681.60x = 5,080.59 × 2,109.69
4. Step 4: Simplify right side
   3,681.60x = 10,718,469.92
5. Step 5: Solve for x
   x = 10,718,469.92/3,681.60
6. Step 6: Final answer
   x = 2,911.36