Finding the Fourth Proportional to 2,059.70, 2,842.37 and 1,128.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,059.70 : 2,842.37 = 1,128.20 : x
2. Step 2: Convert to fraction form
   2,059.70/2,842.37 = 1,128.20/x
3. Step 3: Cross multiply
   2,059.70x = 2,842.37 × 1,128.20
4. Step 4: Simplify right side
   2,059.70x = 3,206,741.98
5. Step 5: Solve for x
   x = 3,206,741.98/2,059.70
6. Step 6: Final answer
   x = 1,556.90