Finding the Fourth Proportional to 2,412.72, 3,321 and 2,221.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,412.72 : 3,321 = 2,221.56 : x
2. Step 2: Convert to fraction form
   2,412.72/3,321 = 2,221.56/x
3. Step 3: Cross multiply
   2,412.72x = 3,321 × 2,221.56
4. Step 4: Simplify right side
   2,412.72x = 7,377,800.76
5. Step 5: Solve for x
   x = 7,377,800.76/2,412.72
6. Step 6: Final answer
   x = 3,057.88