Finding the Fourth Proportional to 1,960.42, 2,940.42 and 727.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,960.42 : 2,940.42 = 727.60 : x
2. Step 2: Convert to fraction form
   1,960.42/2,940.42 = 727.60/x
3. Step 3: Cross multiply
   1,960.42x = 2,940.42 × 727.60
4. Step 4: Simplify right side
   1,960.42x = 2,139,449.59
5. Step 5: Solve for x
   x = 2,139,449.59/1,960.42
6. Step 6: Final answer
   x = 1,091.32