Finding the Fourth Proportional to 12,638.89, 18,958.41 and 5,617.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,638.89 : 18,958.41 = 5,617.25 : x
2. Step 2: Convert to fraction form
   12,638.89/18,958.41 = 5,617.25/x
3. Step 3: Cross multiply
   12,638.89x = 18,958.41 × 5,617.25
4. Step 4: Simplify right side
   12,638.89x = 106,494,128.57
5. Step 5: Solve for x
   x = 106,494,128.57/12,638.89
6. Step 6: Final answer
   x = 8,425.91