Finding the Fourth Proportional to 1,009.82, 1,392.43 and 636.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.82 : 1,392.43 = 636.35 : x
2. Step 2: Convert to fraction form
   1,009.82/1,392.43 = 636.35/x
3. Step 3: Cross multiply
   1,009.82x = 1,392.43 × 636.35
4. Step 4: Simplify right side
   1,009.82x = 886,072.83
5. Step 5: Solve for x
   x = 886,072.83/1,009.82
6. Step 6: Final answer
   x = 877.46