Finding the Fourth Proportional to 13,507.38, 18,640.23 and 7,538.94

Step by Step Solution

1. Step 1: Write the proportion equation
   13,507.38 : 18,640.23 = 7,538.94 : x
2. Step 2: Convert to fraction form
   13,507.38/18,640.23 = 7,538.94/x
3. Step 3: Cross multiply
   13,507.38x = 18,640.23 × 7,538.94
4. Step 4: Simplify right side
   13,507.38x = 140,527,575.56
5. Step 5: Solve for x
   x = 140,527,575.56/13,507.38
6. Step 6: Final answer
   x = 10,403.76