Finding the Fourth Proportional to 1,315.60, 1,815.52 and 791.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.60 : 1,815.52 = 791.52 : x
2. Step 2: Convert to fraction form
   1,315.60/1,815.52 = 791.52/x
3. Step 3: Cross multiply
   1,315.60x = 1,815.52 × 791.52
4. Step 4: Simplify right side
   1,315.60x = 1,437,020.39
5. Step 5: Solve for x
   x = 1,437,020.39/1,315.60
6. Step 6: Final answer
   x = 1,092.29