Finding the Fourth Proportional to 13,636.03, 18,815.73 and 7,971.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,636.03 : 18,815.73 = 7,971.31 : x
2. Step 2: Convert to fraction form
   13,636.03/18,815.73 = 7,971.31/x
3. Step 3: Cross multiply
   13,636.03x = 18,815.73 × 7,971.31
4. Step 4: Simplify right side
   13,636.03x = 149,986,016.71
5. Step 5: Solve for x
   x = 149,986,016.71/13,636.03
6. Step 6: Final answer
   x = 10,999.24