Finding the Fourth Proportional to 3,681.81, 5,080.55 and 2,109.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,681.81 : 5,080.55 = 2,109.69 : x
2. Step 2: Convert to fraction form
   3,681.81/5,080.55 = 2,109.69/x
3. Step 3: Cross multiply
   3,681.81x = 5,080.55 × 2,109.69
4. Step 4: Simplify right side
   3,681.81x = 10,718,374.98
5. Step 5: Solve for x
   x = 10,718,374.98/3,681.81
6. Step 6: Final answer
   x = 2,911.17