Finding the Fourth Proportional to 1,581.26, 2,181.78 and 918.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.26 : 2,181.78 = 918.09 : x
2. Step 2: Convert to fraction form
   1,581.26/2,181.78 = 918.09/x
3. Step 3: Cross multiply
   1,581.26x = 2,181.78 × 918.09
4. Step 4: Simplify right side
   1,581.26x = 2,003,070.40
5. Step 5: Solve for x
   x = 2,003,070.40/1,581.26
6. Step 6: Final answer
   x = 1,266.76