Finding the Fourth Proportional to 1,139.82, 1,709.73 and 318.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.82 : 1,709.73 = 318.18 : x
2. Step 2: Convert to fraction form
   1,139.82/1,709.73 = 318.18/x
3. Step 3: Cross multiply
   1,139.82x = 1,709.73 × 318.18
4. Step 4: Simplify right side
   1,139.82x = 544,001.89
5. Step 5: Solve for x
   x = 544,001.89/1,139.82
6. Step 6: Final answer
   x = 477.27