Finding the Fourth Proportional to 2,059.78, 2,842.47 and 1,128.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,059.78 : 2,842.47 = 1,128.30 : x
2. Step 2: Convert to fraction form
   2,059.78/2,842.47 = 1,128.30/x
3. Step 3: Cross multiply
   2,059.78x = 2,842.47 × 1,128.30
4. Step 4: Simplify right side
   2,059.78x = 3,207,158.90
5. Step 5: Solve for x
   x = 3,207,158.90/2,059.78
6. Step 6: Final answer
   x = 1,557.04