Finding the Fourth Proportional to 12,850.83, 19,266.12 and 8,638.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,850.83 : 19,266.12 = 8,638.38 : x
2. Step 2: Convert to fraction form
   12,850.83/19,266.12 = 8,638.38/x
3. Step 3: Cross multiply
   12,850.83x = 19,266.12 × 8,638.38
4. Step 4: Simplify right side
   12,850.83x = 166,428,065.69
5. Step 5: Solve for x
   x = 166,428,065.69/12,850.83
6. Step 6: Final answer
   x = 12,950.76