Finding the Fourth Proportional to 1,315.52, 1,815.42 and 818.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.52 : 1,815.42 = 818.16 : x
2. Step 2: Convert to fraction form
   1,315.52/1,815.42 = 818.16/x
3. Step 3: Cross multiply
   1,315.52x = 1,815.42 × 818.16
4. Step 4: Simplify right side
   1,315.52x = 1,485,304.03
5. Step 5: Solve for x
   x = 1,485,304.03/1,315.52
6. Step 6: Final answer
   x = 1,129.06