Finding the Fourth Proportional to 1,002.09, 1,383.48 and 629.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.09 : 1,383.48 = 629.39 : x
2. Step 2: Convert to fraction form
   1,002.09/1,383.48 = 629.39/x
3. Step 3: Cross multiply
   1,002.09x = 1,383.48 × 629.39
4. Step 4: Simplify right side
   1,002.09x = 870,744.15
5. Step 5: Solve for x
   x = 870,744.15/1,002.09
6. Step 6: Final answer
   x = 868.93