Finding the Fourth Proportional to 1,420.67, 1,960.35 and 791.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.67 : 1,960.35 = 791.10 : x
2. Step 2: Convert to fraction form
   1,420.67/1,960.35 = 791.10/x
3. Step 3: Cross multiply
   1,420.67x = 1,960.35 × 791.10
4. Step 4: Simplify right side
   1,420.67x = 1,550,832.89
5. Step 5: Solve for x
   x = 1,550,832.89/1,420.67
6. Step 6: Final answer
   x = 1,091.62