Finding the Fourth Proportional to 3,425.81, 5,139.52 and 1,085.92

Step by Step Solution

1. Step 1: Write the proportion equation
   3,425.81 : 5,139.52 = 1,085.92 : x
2. Step 2: Convert to fraction form
   3,425.81/5,139.52 = 1,085.92/x
3. Step 3: Cross multiply
   3,425.81x = 5,139.52 × 1,085.92
4. Step 4: Simplify right side
   3,425.81x = 5,581,091.99
5. Step 5: Solve for x
   x = 5,581,091.99/3,425.81
6. Step 6: Final answer
   x = 1,629.13