Finding the Fourth Proportional to 1,581.07, 2,181.81 and 918.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.07 : 2,181.81 = 918.01 : x
2. Step 2: Convert to fraction form
   1,581.07/2,181.81 = 918.01/x
3. Step 3: Cross multiply
   1,581.07x = 2,181.81 × 918.01
4. Step 4: Simplify right side
   1,581.07x = 2,002,923.40
5. Step 5: Solve for x
   x = 2,002,923.40/1,581.07
6. Step 6: Final answer
   x = 1,266.82