Finding the Fourth Proportional to 13,141.25, 18,136.61 and 8,674.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,141.25 : 18,136.61 = 8,674.31 : x
2. Step 2: Convert to fraction form
   13,141.25/18,136.61 = 8,674.31/x
3. Step 3: Cross multiply
   13,141.25x = 18,136.61 × 8,674.31
4. Step 4: Simplify right side
   13,141.25x = 157,322,443.43
5. Step 5: Solve for x
   x = 157,322,443.43/13,141.25
6. Step 6: Final answer
   x = 11,971.65