Finding the Fourth Proportional to 1,581.81, 2,182.73 and 918.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.81 : 2,182.73 = 918.56 : x
2. Step 2: Convert to fraction form
   1,581.81/2,182.73 = 918.56/x
3. Step 3: Cross multiply
   1,581.81x = 2,182.73 × 918.56
4. Step 4: Simplify right side
   1,581.81x = 2,004,952.96
5. Step 5: Solve for x
   x = 2,004,952.96/1,581.81
6. Step 6: Final answer
   x = 1,267.51