Finding the Fourth Proportional to 3,912.48, 5,870.34 and 2,155.68

Step by Step Solution

1. Step 1: Write the proportion equation
   3,912.48 : 5,870.34 = 2,155.68 : x
2. Step 2: Convert to fraction form
   3,912.48/5,870.34 = 2,155.68/x
3. Step 3: Cross multiply
   3,912.48x = 5,870.34 × 2,155.68
4. Step 4: Simplify right side
   3,912.48x = 12,654,574.53
5. Step 5: Solve for x
   x = 12,654,574.53/3,912.48
6. Step 6: Final answer
   x = 3,234.41