Finding the Fourth Proportional to 3,425.28, 5,139.06 and 1,085.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,425.28 : 5,139.06 = 1,085.59 : x
2. Step 2: Convert to fraction form
   3,425.28/5,139.06 = 1,085.59/x
3. Step 3: Cross multiply
   3,425.28x = 5,139.06 × 1,085.59
4. Step 4: Simplify right side
   3,425.28x = 5,578,912.15
5. Step 5: Solve for x
   x = 5,578,912.15/3,425.28
6. Step 6: Final answer
   x = 1,628.75