Finding the Fourth Proportional to 3,870.84, 5,339.74 and 2,379.09

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.84 : 5,339.74 = 2,379.09 : x
2. Step 2: Convert to fraction form
   3,870.84/5,339.74 = 2,379.09/x
3. Step 3: Cross multiply
   3,870.84x = 5,339.74 × 2,379.09
4. Step 4: Simplify right side
   3,870.84x = 12,703,722.04
5. Step 5: Solve for x
   x = 12,703,722.04/3,870.84
6. Step 6: Final answer
   x = 3,281.90