Finding the Fourth Proportional to 1,003.05, 1,383.72 and 629.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.05 : 1,383.72 = 629.34 : x
2. Step 2: Convert to fraction form
   1,003.05/1,383.72 = 629.34/x
3. Step 3: Cross multiply
   1,003.05x = 1,383.72 × 629.34
4. Step 4: Simplify right side
   1,003.05x = 870,830.34
5. Step 5: Solve for x
   x = 870,830.34/1,003.05
6. Step 6: Final answer
   x = 868.18