Finding the Fourth Proportional to 3,681.72, 5,080.80 and 2,109.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,681.72 : 5,080.80 = 2,109.96 : x
2. Step 2: Convert to fraction form
   3,681.72/5,080.80 = 2,109.96/x
3. Step 3: Cross multiply
   3,681.72x = 5,080.80 × 2,109.96
4. Step 4: Simplify right side
   3,681.72x = 10,720,284.77
5. Step 5: Solve for x
   x = 10,720,284.77/3,681.72
6. Step 6: Final answer
   x = 2,911.76