Finding the Fourth Proportional to 3,868.71, 5,338.79 and 2,100.32

Step by Step Solution

1. Step 1: Write the proportion equation
   3,868.71 : 5,338.79 = 2,100.32 : x
2. Step 2: Convert to fraction form
   3,868.71/5,338.79 = 2,100.32/x
3. Step 3: Cross multiply
   3,868.71x = 5,338.79 × 2,100.32
4. Step 4: Simplify right side
   3,868.71x = 11,213,167.41
5. Step 5: Solve for x
   x = 11,213,167.41/3,868.71
6. Step 6: Final answer
   x = 2,898.43