Finding the Fourth Proportional to 2,067.10, 3,100.80 and 1,243.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,067.10 : 3,100.80 = 1,243.60 : x
2. Step 2: Convert to fraction form
   2,067.10/3,100.80 = 1,243.60/x
3. Step 3: Cross multiply
   2,067.10x = 3,100.80 × 1,243.60
4. Step 4: Simplify right side
   2,067.10x = 3,856,154.88
5. Step 5: Solve for x
   x = 3,856,154.88/2,067.10
6. Step 6: Final answer
   x = 1,865.49