Finding the Fourth Proportional to 3,891.98, 5,371.31 and 2,213.46

Step by Step Solution

1. Step 1: Write the proportion equation
   3,891.98 : 5,371.31 = 2,213.46 : x
2. Step 2: Convert to fraction form
   3,891.98/5,371.31 = 2,213.46/x
3. Step 3: Cross multiply
   3,891.98x = 5,371.31 × 2,213.46
4. Step 4: Simplify right side
   3,891.98x = 11,889,185.37
5. Step 5: Solve for x
   x = 11,889,185.37/3,891.98
6. Step 6: Final answer
   x = 3,054.79