Finding the Fourth Proportional to 1,581.32, 2,182.22 and 918.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.32 : 2,182.22 = 918.56 : x
2. Step 2: Convert to fraction form
   1,581.32/2,182.22 = 918.56/x
3. Step 3: Cross multiply
   1,581.32x = 2,182.22 × 918.56
4. Step 4: Simplify right side
   1,581.32x = 2,004,484.50
5. Step 5: Solve for x
   x = 2,004,484.50/1,581.32
6. Step 6: Final answer
   x = 1,267.61