Finding the Fourth Proportional to 8,139.89, 12,189.92 and 7,351.03

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139.89 : 12,189.92 = 7,351.03 : x
2. Step 2: Convert to fraction form
   8,139.89/12,189.92 = 7,351.03/x
3. Step 3: Cross multiply
   8,139.89x = 12,189.92 × 7,351.03
4. Step 4: Simplify right side
   8,139.89x = 89,608,467.62
5. Step 5: Solve for x
   x = 89,608,467.62/8,139.89
6. Step 6: Final answer
   x = 11,008.56