Finding the Fourth Proportional to 1,959.40, 2,940.72 and 864.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,959.40 : 2,940.72 = 864.56 : x
2. Step 2: Convert to fraction form
   1,959.40/2,940.72 = 864.56/x
3. Step 3: Cross multiply
   1,959.40x = 2,940.72 × 864.56
4. Step 4: Simplify right side
   1,959.40x = 2,542,428.88
5. Step 5: Solve for x
   x = 2,542,428.88/1,959.40
6. Step 6: Final answer
   x = 1,297.55