Finding the Fourth Proportional to 3,989.94, 5,506.01 and 2,221.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,989.94 : 5,506.01 = 2,221.50 : x
2. Step 2: Convert to fraction form
   3,989.94/5,506.01 = 2,221.50/x
3. Step 3: Cross multiply
   3,989.94x = 5,506.01 × 2,221.50
4. Step 4: Simplify right side
   3,989.94x = 12,231,631.58
5. Step 5: Solve for x
   x = 12,231,631.58/3,989.94
6. Step 6: Final answer
   x = 3,065.62