Finding the Fourth Proportional to 1,002.31, 1,383.37 and 629.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.31 : 1,383.37 = 629.62 : x
2. Step 2: Convert to fraction form
   1,002.31/1,383.37 = 629.62/x
3. Step 3: Cross multiply
   1,002.31x = 1,383.37 × 629.62
4. Step 4: Simplify right side
   1,002.31x = 870,997.42
5. Step 5: Solve for x
   x = 870,997.42/1,002.31
6. Step 6: Final answer
   x = 868.99