Finding the Fourth Proportional to 1,315.94, 1,815.72 and 792

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.94 : 1,815.72 = 792 : x
2. Step 2: Convert to fraction form
   1,315.94/1,815.72 = 792/x
3. Step 3: Cross multiply
   1,315.94x = 1,815.72 × 792
4. Step 4: Simplify right side
   1,315.94x = 1,438,050.24
5. Step 5: Solve for x
   x = 1,438,050.24/1,315.94
6. Step 6: Final answer
   x = 1,092.80