Finding the Fourth Proportional to 3,868.59, 5,338.76 and 2,100.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,868.59 : 5,338.76 = 2,100.31 : x
2. Step 2: Convert to fraction form
   3,868.59/5,338.76 = 2,100.31/x
3. Step 3: Cross multiply
   3,868.59x = 5,338.76 × 2,100.31
4. Step 4: Simplify right side
   3,868.59x = 11,213,056.27
5. Step 5: Solve for x
   x = 11,213,056.27/3,868.59
6. Step 6: Final answer
   x = 2,898.49