Finding the Fourth Proportional to 3,638.22, 5,019.89 and 2,518.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,638.22 : 5,019.89 = 2,518.80 : x
2. Step 2: Convert to fraction form
   3,638.22/5,019.89 = 2,518.80/x
3. Step 3: Cross multiply
   3,638.22x = 5,019.89 × 2,518.80
4. Step 4: Simplify right side
   3,638.22x = 12,644,086.34
5. Step 5: Solve for x
   x = 12,644,086.34/3,638.22
6. Step 6: Final answer
   x = 3,475.35