Finding the Fourth Proportional to 1,025.82, 1,540.44 and 636.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,025.82 : 1,540.44 = 636.57 : x
2. Step 2: Convert to fraction form
   1,025.82/1,540.44 = 636.57/x
3. Step 3: Cross multiply
   1,025.82x = 1,540.44 × 636.57
4. Step 4: Simplify right side
   1,025.82x = 980,597.89
5. Step 5: Solve for x
   x = 980,597.89/1,025.82
6. Step 6: Final answer
   x = 955.92