Finding the Fourth Proportional to 1,420.89, 1,960.81 and 791.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.89 : 1,960.81 = 791.42 : x
2. Step 2: Convert to fraction form
   1,420.89/1,960.81 = 791.42/x
3. Step 3: Cross multiply
   1,420.89x = 1,960.81 × 791.42
4. Step 4: Simplify right side
   1,420.89x = 1,551,812.47
5. Step 5: Solve for x
   x = 1,551,812.47/1,420.89
6. Step 6: Final answer
   x = 1,092.14