Finding the Fourth Proportional to 3,894.89, 5,374.89 and 2,215.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,894.89 : 5,374.89 = 2,215.96 : x
2. Step 2: Convert to fraction form
   3,894.89/5,374.89 = 2,215.96/x
3. Step 3: Cross multiply
   3,894.89x = 5,374.89 × 2,215.96
4. Step 4: Simplify right side
   3,894.89x = 11,910,527.81
5. Step 5: Solve for x
   x = 11,910,527.81/3,894.89
6. Step 6: Final answer
   x = 3,057.99