Finding the Fourth Proportional to 1,317.67, 1,818.39 and 728.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,317.67 : 1,818.39 = 728.25 : x
2. Step 2: Convert to fraction form
   1,317.67/1,818.39 = 728.25/x
3. Step 3: Cross multiply
   1,317.67x = 1,818.39 × 728.25
4. Step 4: Simplify right side
   1,317.67x = 1,324,242.52
5. Step 5: Solve for x
   x = 1,324,242.52/1,317.67
6. Step 6: Final answer
   x = 1,004.99