Finding the Fourth Proportional to 1,957.40, 2,936.78 and 862.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,957.40 : 2,936.78 = 862.55 : x
2. Step 2: Convert to fraction form
   1,957.40/2,936.78 = 862.55/x
3. Step 3: Cross multiply
   1,957.40x = 2,936.78 × 862.55
4. Step 4: Simplify right side
   1,957.40x = 2,533,100.59
5. Step 5: Solve for x
   x = 2,533,100.59/1,957.40
6. Step 6: Final answer
   x = 1,294.12