Finding the Fourth Proportional to 1,315.79, 1,814.52 and 843.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.79 : 1,814.52 = 843.15 : x
2. Step 2: Convert to fraction form
   1,315.79/1,814.52 = 843.15/x
3. Step 3: Cross multiply
   1,315.79x = 1,814.52 × 843.15
4. Step 4: Simplify right side
   1,315.79x = 1,529,908.32
5. Step 5: Solve for x
   x = 1,529,908.32/1,315.79
6. Step 6: Final answer
   x = 1,162.73