Finding the Fourth Proportional to 12,636.69, 18,956.25 and 3,870.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,636.69 : 18,956.25 = 3,870.06 : x
2. Step 2: Convert to fraction form
   12,636.69/18,956.25 = 3,870.06/x
3. Step 3: Cross multiply
   12,636.69x = 18,956.25 × 3,870.06
4. Step 4: Simplify right side
   12,636.69x = 73,361,824.88
5. Step 5: Solve for x
   x = 73,361,824.88/12,636.69
6. Step 6: Final answer
   x = 5,805.46