Finding the Fourth Proportional to 1,002.90, 1,383.57 and 629.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.90 : 1,383.57 = 629.82 : x
2. Step 2: Convert to fraction form
   1,002.90/1,383.57 = 629.82/x
3. Step 3: Cross multiply
   1,002.90x = 1,383.57 × 629.82
4. Step 4: Simplify right side
   1,002.90x = 871,400.06
5. Step 5: Solve for x
   x = 871,400.06/1,002.90
6. Step 6: Final answer
   x = 868.88