Finding the Fourth Proportional to 3,898.72, 5,380.82 and 2,219.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,898.72 : 5,380.82 = 2,219.72 : x
2. Step 2: Convert to fraction form
   3,898.72/5,380.82 = 2,219.72/x
3. Step 3: Cross multiply
   3,898.72x = 5,380.82 × 2,219.72
4. Step 4: Simplify right side
   3,898.72x = 11,943,913.77
5. Step 5: Solve for x
   x = 11,943,913.77/3,898.72
6. Step 6: Final answer
   x = 3,063.55