Finding the Fourth Proportional to 3,868.62, 5,338.53 and 2,100.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,868.62 : 5,338.53 = 2,100.15 : x
2. Step 2: Convert to fraction form
   3,868.62/5,338.53 = 2,100.15/x
3. Step 3: Cross multiply
   3,868.62x = 5,338.53 × 2,100.15
4. Step 4: Simplify right side
   3,868.62x = 11,211,713.78
5. Step 5: Solve for x
   x = 11,211,713.78/3,868.62
6. Step 6: Final answer
   x = 2,898.12