Finding the Fourth Proportional to 1,581.65, 2,182.68 and 918.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.65 : 2,182.68 = 918.89 : x
2. Step 2: Convert to fraction form
   1,581.65/2,182.68 = 918.89/x
3. Step 3: Cross multiply
   1,581.65x = 2,182.68 × 918.89
4. Step 4: Simplify right side
   1,581.65x = 2,005,642.83
5. Step 5: Solve for x
   x = 2,005,642.83/1,581.65
6. Step 6: Final answer
   x = 1,268.07