Finding the Fourth Proportional to 3,681.56, 5,081.25 and 2,109.65

Step by Step Solution

1. Step 1: Write the proportion equation
   3,681.56 : 5,081.25 = 2,109.65 : x
2. Step 2: Convert to fraction form
   3,681.56/5,081.25 = 2,109.65/x
3. Step 3: Cross multiply
   3,681.56x = 5,081.25 × 2,109.65
4. Step 4: Simplify right side
   3,681.56x = 10,719,648.51
5. Step 5: Solve for x
   x = 10,719,648.51/3,681.56
6. Step 6: Final answer
   x = 2,911.71