Finding the Fourth Proportional to 1,315.37, 1,815.31 and 818.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.37 : 1,815.31 = 818.03 : x
2. Step 2: Convert to fraction form
   1,315.37/1,815.31 = 818.03/x
3. Step 3: Cross multiply
   1,315.37x = 1,815.31 × 818.03
4. Step 4: Simplify right side
   1,315.37x = 1,484,983.60
5. Step 5: Solve for x
   x = 1,484,983.60/1,315.37
6. Step 6: Final answer
   x = 1,128.95