Finding the Fourth Proportional to 11,871.20, 17,815.56 and 5,631.18

Step by Step Solution

1. Step 1: Write the proportion equation
   11,871.20 : 17,815.56 = 5,631.18 : x
2. Step 2: Convert to fraction form
   11,871.20/17,815.56 = 5,631.18/x
3. Step 3: Cross multiply
   11,871.20x = 17,815.56 × 5,631.18
4. Step 4: Simplify right side
   11,871.20x = 100,322,625.16
5. Step 5: Solve for x
   x = 100,322,625.16/11,871.20
6. Step 6: Final answer
   x = 8,450.93