Finding the Fourth Proportional to 1,420.84, 1,960.60 and 791.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.84 : 1,960.60 = 791.36 : x
2. Step 2: Convert to fraction form
   1,420.84/1,960.60 = 791.36/x
3. Step 3: Cross multiply
   1,420.84x = 1,960.60 × 791.36
4. Step 4: Simplify right side
   1,420.84x = 1,551,540.42
5. Step 5: Solve for x
   x = 1,551,540.42/1,420.84
6. Step 6: Final answer
   x = 1,091.99