Finding the Fourth Proportional to 1,315.18, 1,814.69 and 791.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.18 : 1,814.69 = 791.24 : x
2. Step 2: Convert to fraction form
   1,315.18/1,814.69 = 791.24/x
3. Step 3: Cross multiply
   1,315.18x = 1,814.69 × 791.24
4. Step 4: Simplify right side
   1,315.18x = 1,435,861.83
5. Step 5: Solve for x
   x = 1,435,861.83/1,315.18
6. Step 6: Final answer
   x = 1,091.76