Finding the Fourth Proportional to 1,420.59, 1,960.35 and 791.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.59 : 1,960.35 = 791.07 : x
2. Step 2: Convert to fraction form
   1,420.59/1,960.35 = 791.07/x
3. Step 3: Cross multiply
   1,420.59x = 1,960.35 × 791.07
4. Step 4: Simplify right side
   1,420.59x = 1,550,768.21
5. Step 5: Solve for x
   x = 1,550,768.21/1,420.59
6. Step 6: Final answer
   x = 1,091.64