Finding the Fourth Proportional to 1,317.18, 1,817.71 and 727.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,317.18 : 1,817.71 = 727.72 : x
2. Step 2: Convert to fraction form
   1,317.18/1,817.71 = 727.72/x
3. Step 3: Cross multiply
   1,317.18x = 1,817.71 × 727.72
4. Step 4: Simplify right side
   1,317.18x = 1,322,783.92
5. Step 5: Solve for x
   x = 1,322,783.92/1,317.18
6. Step 6: Final answer
   x = 1,004.25