Finding the Fourth Proportional to 13,507.82, 18,640.81 and 7,539.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,507.82 : 18,640.81 = 7,539.49 : x
2. Step 2: Convert to fraction form
   13,507.82/18,640.81 = 7,539.49/x
3. Step 3: Cross multiply
   13,507.82x = 18,640.81 × 7,539.49
4. Step 4: Simplify right side
   13,507.82x = 140,542,128.46
5. Step 5: Solve for x
   x = 140,542,128.46/13,507.82
6. Step 6: Final answer
   x = 10,404.50