Finding the Fourth Proportional to 1,317.41, 1,818.12 and 728.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,317.41 : 1,818.12 = 728.05 : x
2. Step 2: Convert to fraction form
   1,317.41/1,818.12 = 728.05/x
3. Step 3: Cross multiply
   1,317.41x = 1,818.12 × 728.05
4. Step 4: Simplify right side
   1,317.41x = 1,323,680.45
5. Step 5: Solve for x
   x = 1,323,680.45/1,317.41
6. Step 6: Final answer
   x = 1,004.76