Finding the Fourth Proportional to 1,420.81, 1,960.72 and 791.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.81 : 1,960.72 = 791.33 : x
2. Step 2: Convert to fraction form
   1,420.81/1,960.72 = 791.33/x
3. Step 3: Cross multiply
   1,420.81x = 1,960.72 × 791.33
4. Step 4: Simplify right side
   1,420.81x = 1,551,564.78
5. Step 5: Solve for x
   x = 1,551,564.78/1,420.81
6. Step 6: Final answer
   x = 1,092.03