Finding the Fourth Proportional to 1,078.07, 1,487.52 and 636.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.07 : 1,487.52 = 636.12 : x
2. Step 2: Convert to fraction form
   1,078.07/1,487.52 = 636.12/x
3. Step 3: Cross multiply
   1,078.07x = 1,487.52 × 636.12
4. Step 4: Simplify right side
   1,078.07x = 946,241.22
5. Step 5: Solve for x
   x = 946,241.22/1,078.07
6. Step 6: Final answer
   x = 877.72