Finding the Fourth Proportional to 3,868.87, 5,339.15 and 2,100.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,868.87 : 5,339.15 = 2,100.59 : x
2. Step 2: Convert to fraction form
   3,868.87/5,339.15 = 2,100.59/x
3. Step 3: Cross multiply
   3,868.87x = 5,339.15 × 2,100.59
4. Step 4: Simplify right side
   3,868.87x = 11,215,365.10
5. Step 5: Solve for x
   x = 11,215,365.10/3,868.87
6. Step 6: Final answer
   x = 2,898.87