Finding the Fourth Proportional to 3,980.58, 5,493.39 and 2,212.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.58 : 5,493.39 = 2,212.20 : x
2. Step 2: Convert to fraction form
   3,980.58/5,493.39 = 2,212.20/x
3. Step 3: Cross multiply
   3,980.58x = 5,493.39 × 2,212.20
4. Step 4: Simplify right side
   3,980.58x = 12,152,477.36
5. Step 5: Solve for x
   x = 12,152,477.36/3,980.58
6. Step 6: Final answer
   x = 3,052.94