Finding the Fourth Proportional to 1,103.69, 1,522.95 and 631.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.69 : 1,522.95 = 631.61 : x
2. Step 2: Convert to fraction form
   1,103.69/1,522.95 = 631.61/x
3. Step 3: Cross multiply
   1,103.69x = 1,522.95 × 631.61
4. Step 4: Simplify right side
   1,103.69x = 961,918.30
5. Step 5: Solve for x
   x = 961,918.30/1,103.69
6. Step 6: Final answer
   x = 871.55