Finding the Fourth Proportional to 2,362.20, 3,540.84 and 1,128.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,362.20 : 3,540.84 = 1,128.60 : x
2. Step 2: Convert to fraction form
   2,362.20/3,540.84 = 1,128.60/x
3. Step 3: Cross multiply
   2,362.20x = 3,540.84 × 1,128.60
4. Step 4: Simplify right side
   2,362.20x = 3,996,192.02
5. Step 5: Solve for x
   x = 3,996,192.02/2,362.20
6. Step 6: Final answer
   x = 1,691.72