Finding the Fourth Proportional to 3,638.55, 5,019.98 and 2,221.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,638.55 : 5,019.98 = 2,221.72 : x
2. Step 2: Convert to fraction form
   3,638.55/5,019.98 = 2,221.72/x
3. Step 3: Cross multiply
   3,638.55x = 5,019.98 × 2,221.72
4. Step 4: Simplify right side
   3,638.55x = 11,152,989.97
5. Step 5: Solve for x
   x = 11,152,989.97/3,638.55
6. Step 6: Final answer
   x = 3,065.23