Finding the Fourth Proportional to 12,636.98, 18,957.89 and 3,871.97

Step by Step Solution

1. Step 1: Write the proportion equation
   12,636.98 : 18,957.89 = 3,871.97 : x
2. Step 2: Convert to fraction form
   12,636.98/18,957.89 = 3,871.97/x
3. Step 3: Cross multiply
   12,636.98x = 18,957.89 × 3,871.97
4. Step 4: Simplify right side
   12,636.98x = 73,404,296.23
5. Step 5: Solve for x
   x = 73,404,296.23/12,636.98
6. Step 6: Final answer
   x = 5,808.69