Finding the Fourth Proportional to 1,391.56, 1,920.56 and 794.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.56 : 1,920.56 = 794.05 : x
2. Step 2: Convert to fraction form
   1,391.56/1,920.56 = 794.05/x
3. Step 3: Cross multiply
   1,391.56x = 1,920.56 × 794.05
4. Step 4: Simplify right side
   1,391.56x = 1,525,011.90
5. Step 5: Solve for x
   x = 1,525,011.90/1,391.56
6. Step 6: Final answer
   x = 1,095.90