Finding the Fourth Proportional to 1,315.82, 1,816.25 and 818.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.82 : 1,816.25 = 818.16 : x
2. Step 2: Convert to fraction form
   1,315.82/1,816.25 = 818.16/x
3. Step 3: Cross multiply
   1,315.82x = 1,816.25 × 818.16
4. Step 4: Simplify right side
   1,315.82x = 1,485,983.10
5. Step 5: Solve for x
   x = 1,485,983.10/1,315.82
6. Step 6: Final answer
   x = 1,129.32