Finding the Fourth Proportional to 2,141.20, 3,209.40 and 1,100.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,141.20 : 3,209.40 = 1,100.80 : x
2. Step 2: Convert to fraction form
   2,141.20/3,209.40 = 1,100.80/x
3. Step 3: Cross multiply
   2,141.20x = 3,209.40 × 1,100.80
4. Step 4: Simplify right side
   2,141.20x = 3,532,907.52
5. Step 5: Solve for x
   x = 3,532,907.52/2,141.20
6. Step 6: Final answer
   x = 1,649.97