Finding the Fourth Proportional to 12,203.78, 18,308.33 and 5,189.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,203.78 : 18,308.33 = 5,189.78 : x
2. Step 2: Convert to fraction form
   12,203.78/18,308.33 = 5,189.78/x
3. Step 3: Cross multiply
   12,203.78x = 18,308.33 × 5,189.78
4. Step 4: Simplify right side
   12,203.78x = 95,016,087.38
5. Step 5: Solve for x
   x = 95,016,087.38/12,203.78
6. Step 6: Final answer
   x = 7,785.79