Finding the Fourth Proportional to 1,078.10, 1,487.94 and 636.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.10 : 1,487.94 = 636.04 : x
2. Step 2: Convert to fraction form
   1,078.10/1,487.94 = 636.04/x
3. Step 3: Cross multiply
   1,078.10x = 1,487.94 × 636.04
4. Step 4: Simplify right side
   1,078.10x = 946,385.64
5. Step 5: Solve for x
   x = 946,385.64/1,078.10
6. Step 6: Final answer
   x = 877.83