Finding the Fourth Proportional to 1,103.51, 1,522.78 and 631.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.51 : 1,522.78 = 631.41 : x
2. Step 2: Convert to fraction form
   1,103.51/1,522.78 = 631.41/x
3. Step 3: Cross multiply
   1,103.51x = 1,522.78 × 631.41
4. Step 4: Simplify right side
   1,103.51x = 961,496.94
5. Step 5: Solve for x
   x = 961,496.94/1,103.51
6. Step 6: Final answer
   x = 871.31