Finding the Fourth Proportional to 3,995.81, 5,517.61 and 3,817.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,995.81 : 5,517.61 = 3,817.61 : x
2. Step 2: Convert to fraction form
   3,995.81/5,517.61 = 3,817.61/x
3. Step 3: Cross multiply
   3,995.81x = 5,517.61 × 3,817.61
4. Step 4: Simplify right side
   3,995.81x = 21,064,045.98
5. Step 5: Solve for x
   x = 21,064,045.98/3,995.81
6. Step 6: Final answer
   x = 5,271.54