Finding the Fourth Proportional to 3,868.91, 5,339.14 and 2,100.54

Step by Step Solution

1. Step 1: Write the proportion equation
   3,868.91 : 5,339.14 = 2,100.54 : x
2. Step 2: Convert to fraction form
   3,868.91/5,339.14 = 2,100.54/x
3. Step 3: Cross multiply
   3,868.91x = 5,339.14 × 2,100.54
4. Step 4: Simplify right side
   3,868.91x = 11,215,071.88
5. Step 5: Solve for x
   x = 11,215,071.88/3,868.91
6. Step 6: Final answer
   x = 2,898.77