Finding the Fourth Proportional to 1,078.27, 1,487.94 and 636.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.27 : 1,487.94 = 636.24 : x
2. Step 2: Convert to fraction form
   1,078.27/1,487.94 = 636.24/x
3. Step 3: Cross multiply
   1,078.27x = 1,487.94 × 636.24
4. Step 4: Simplify right side
   1,078.27x = 946,686.95
5. Step 5: Solve for x
   x = 946,686.95/1,078.27
6. Step 6: Final answer
   x = 877.97