Finding the Fourth Proportional to 1,317.32, 1,818.82 and 820.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,317.32 : 1,818.82 = 820.16 : x
2. Step 2: Convert to fraction form
   1,317.32/1,818.82 = 820.16/x
3. Step 3: Cross multiply
   1,317.32x = 1,818.82 × 820.16
4. Step 4: Simplify right side
   1,317.32x = 1,491,723.41
5. Step 5: Solve for x
   x = 1,491,723.41/1,317.32
6. Step 6: Final answer
   x = 1,132.39