Finding the Fourth Proportional to 1,581.31, 2,181.96 and 918.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.31 : 2,181.96 = 918.03 : x
2. Step 2: Convert to fraction form
   1,581.31/2,181.96 = 918.03/x
3. Step 3: Cross multiply
   1,581.31x = 2,181.96 × 918.03
4. Step 4: Simplify right side
   1,581.31x = 2,003,104.74
5. Step 5: Solve for x
   x = 2,003,104.74/1,581.31
6. Step 6: Final answer
   x = 1,266.74