Finding the Fourth Proportional to 3,426.53, 5,139.72 and 1,086.44

Step by Step Solution

1. Step 1: Write the proportion equation
   3,426.53 : 5,139.72 = 1,086.44 : x
2. Step 2: Convert to fraction form
   3,426.53/5,139.72 = 1,086.44/x
3. Step 3: Cross multiply
   3,426.53x = 5,139.72 × 1,086.44
4. Step 4: Simplify right side
   3,426.53x = 5,583,971.70
5. Step 5: Solve for x
   x = 5,583,971.70/3,426.53
6. Step 6: Final answer
   x = 1,629.63