Finding the Fourth Proportional to 3,426.72, 5,140.28 and 1,086.81

Step by Step Solution

1. Step 1: Write the proportion equation
   3,426.72 : 5,140.28 = 1,086.81 : x
2. Step 2: Convert to fraction form
   3,426.72/5,140.28 = 1,086.81/x
3. Step 3: Cross multiply
   3,426.72x = 5,140.28 × 1,086.81
4. Step 4: Simplify right side
   3,426.72x = 5,586,507.71
5. Step 5: Solve for x
   x = 5,586,507.71/3,426.72
6. Step 6: Final answer
   x = 1,630.28