Finding the Fourth Proportional to 3,870.27, 5,815.67 and 2,116.35

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.27 : 5,815.67 = 2,116.35 : x
2. Step 2: Convert to fraction form
   3,870.27/5,815.67 = 2,116.35/x
3. Step 3: Cross multiply
   3,870.27x = 5,815.67 × 2,116.35
4. Step 4: Simplify right side
   3,870.27x = 12,307,982.62
5. Step 5: Solve for x
   x = 12,307,982.62/3,870.27
6. Step 6: Final answer
   x = 3,180.14