Finding the Fourth Proportional to 3,989.72, 5,504.52 and 2,220.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,989.72 : 5,504.52 = 2,220.98 : x
2. Step 2: Convert to fraction form
   3,989.72/5,504.52 = 2,220.98/x
3. Step 3: Cross multiply
   3,989.72x = 5,504.52 × 2,220.98
4. Step 4: Simplify right side
   3,989.72x = 12,225,428.83
5. Step 5: Solve for x
   x = 12,225,428.83/3,989.72
6. Step 6: Final answer
   x = 3,064.23