Finding the Fourth Proportional to 12,538.82, 18,774.21 and 8,145.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,538.82 : 18,774.21 = 8,145.38 : x
2. Step 2: Convert to fraction form
   12,538.82/18,774.21 = 8,145.38/x
3. Step 3: Cross multiply
   12,538.82x = 18,774.21 × 8,145.38
4. Step 4: Simplify right side
   12,538.82x = 152,923,074.65
5. Step 5: Solve for x
   x = 152,923,074.65/12,538.82
6. Step 6: Final answer
   x = 12,195.97