Finding the Fourth Proportional to 1,581.29, 2,181.27 and 918.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.29 : 2,181.27 = 918.06 : x
2. Step 2: Convert to fraction form
   1,581.29/2,181.27 = 918.06/x
3. Step 3: Cross multiply
   1,581.29x = 2,181.27 × 918.06
4. Step 4: Simplify right side
   1,581.29x = 2,002,536.74
5. Step 5: Solve for x
   x = 2,002,536.74/1,581.29
6. Step 6: Final answer
   x = 1,266.39