Finding the Fourth Proportional to 1,103.40, 1,522.59 and 631.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.40 : 1,522.59 = 631.20 : x
2. Step 2: Convert to fraction form
   1,103.40/1,522.59 = 631.20/x
3. Step 3: Cross multiply
   1,103.40x = 1,522.59 × 631.20
4. Step 4: Simplify right side
   1,103.40x = 961,058.81
5. Step 5: Solve for x
   x = 961,058.81/1,103.40
6. Step 6: Final answer
   x = 871.00