Finding the Fourth Proportional to 12,359.98, 17,050.87 and 8,109.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,359.98 : 17,050.87 = 8,109.30 : x
2. Step 2: Convert to fraction form
   12,359.98/17,050.87 = 8,109.30/x
3. Step 3: Cross multiply
   12,359.98x = 17,050.87 × 8,109.30
4. Step 4: Simplify right side
   12,359.98x = 138,270,620.09
5. Step 5: Solve for x
   x = 138,270,620.09/12,359.98
6. Step 6: Final answer
   x = 11,186.96