Finding the Fourth Proportional to 3,681.76, 5,080.80 and 2,109.82

Step by Step Solution

1. Step 1: Write the proportion equation
   3,681.76 : 5,080.80 = 2,109.82 : x
2. Step 2: Convert to fraction form
   3,681.76/5,080.80 = 2,109.82/x
3. Step 3: Cross multiply
   3,681.76x = 5,080.80 × 2,109.82
4. Step 4: Simplify right side
   3,681.76x = 10,719,573.46
5. Step 5: Solve for x
   x = 10,719,573.46/3,681.76
6. Step 6: Final answer
   x = 2,911.54