Finding the Fourth Proportional to 1,960.82, 2,940.37 and 921.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,960.82 : 2,940.37 = 921.12 : x
2. Step 2: Convert to fraction form
   1,960.82/2,940.37 = 921.12/x
3. Step 3: Cross multiply
   1,960.82x = 2,940.37 × 921.12
4. Step 4: Simplify right side
   1,960.82x = 2,708,436.82
5. Step 5: Solve for x
   x = 2,708,436.82/1,960.82
6. Step 6: Final answer
   x = 1,381.27