Finding the Fourth Proportional to 13,507.25, 18,638.15 and 7,538.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,507.25 : 18,638.15 = 7,538.15 : x
2. Step 2: Convert to fraction form
   13,507.25/18,638.15 = 7,538.15/x
3. Step 3: Cross multiply
   13,507.25x = 18,638.15 × 7,538.15
4. Step 4: Simplify right side
   13,507.25x = 140,497,039.54
5. Step 5: Solve for x
   x = 140,497,039.54/13,507.25
6. Step 6: Final answer
   x = 10,401.61