Finding the Fourth Proportional to 3,869.10, 5,339.34 and 2,100.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,869.10 : 5,339.34 = 2,100.69 : x
2. Step 2: Convert to fraction form
   3,869.10/5,339.34 = 2,100.69/x
3. Step 3: Cross multiply
   3,869.10x = 5,339.34 × 2,100.69
4. Step 4: Simplify right side
   3,869.10x = 11,216,298.14
5. Step 5: Solve for x
   x = 11,216,298.14/3,869.10
6. Step 6: Final answer
   x = 2,898.94