Finding the Fourth Proportional to 1,581.72, 2,182.78 and 918.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.72 : 2,182.78 = 918.96 : x
2. Step 2: Convert to fraction form
   1,581.72/2,182.78 = 918.96/x
3. Step 3: Cross multiply
   1,581.72x = 2,182.78 × 918.96
4. Step 4: Simplify right side
   1,581.72x = 2,005,887.51
5. Step 5: Solve for x
   x = 2,005,887.51/1,581.72
6. Step 6: Final answer
   x = 1,268.17