Finding the Fourth Proportional to 8,136.71, 12,207.81 and 3,456.53

Step by Step Solution

1. Step 1: Write the proportion equation
   8,136.71 : 12,207.81 = 3,456.53 : x
2. Step 2: Convert to fraction form
   8,136.71/12,207.81 = 3,456.53/x
3. Step 3: Cross multiply
   8,136.71x = 12,207.81 × 3,456.53
4. Step 4: Simplify right side
   8,136.71x = 42,196,600.46
5. Step 5: Solve for x
   x = 42,196,600.46/8,136.71
6. Step 6: Final answer
   x = 5,185.96