Finding the Fourth Proportional to 15,323.40, 21,145.50 and 8,609.31

Step by Step Solution

1. Step 1: Write the proportion equation
   15,323.40 : 21,145.50 = 8,609.31 : x
2. Step 2: Convert to fraction form
   15,323.40/21,145.50 = 8,609.31/x
3. Step 3: Cross multiply
   15,323.40x = 21,145.50 × 8,609.31
4. Step 4: Simplify right side
   15,323.40x = 182,048,164.61
5. Step 5: Solve for x
   x = 182,048,164.61/15,323.40
6. Step 6: Final answer
   x = 11,880.40