Finding the Fourth Proportional to 1,003.69, 1,385.94 and 631.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.69 : 1,385.94 = 631.29 : x
2. Step 2: Convert to fraction form
   1,003.69/1,385.94 = 631.29/x
3. Step 3: Cross multiply
   1,003.69x = 1,385.94 × 631.29
4. Step 4: Simplify right side
   1,003.69x = 874,932.43
5. Step 5: Solve for x
   x = 874,932.43/1,003.69
6. Step 6: Final answer
   x = 871.72