Finding the Fourth Proportional to 3,980.81, 5,493.56 and 2,212.79

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.81 : 5,493.56 = 2,212.79 : x
2. Step 2: Convert to fraction form
   3,980.81/5,493.56 = 2,212.79/x
3. Step 3: Cross multiply
   3,980.81x = 5,493.56 × 2,212.79
4. Step 4: Simplify right side
   3,980.81x = 12,156,056.10
5. Step 5: Solve for x
   x = 12,156,056.10/3,980.81
6. Step 6: Final answer
   x = 3,053.66