Finding the Fourth Proportional to 3,426.78, 5,141.07 and 1,086.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,426.78 : 5,141.07 = 1,086.87 : x
2. Step 2: Convert to fraction form
   3,426.78/5,141.07 = 1,086.87/x
3. Step 3: Cross multiply
   3,426.78x = 5,141.07 × 1,086.87
4. Step 4: Simplify right side
   3,426.78x = 5,587,674.75
5. Step 5: Solve for x
   x = 5,587,674.75/3,426.78
6. Step 6: Final answer
   x = 1,630.59