Finding the Fourth Proportional to 12,379.95, 17,087.67 and 7,661.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,379.95 : 17,087.67 = 7,661.61 : x
2. Step 2: Convert to fraction form
   12,379.95/17,087.67 = 7,661.61/x
3. Step 3: Cross multiply
   12,379.95x = 17,087.67 × 7,661.61
4. Step 4: Simplify right side
   12,379.95x = 130,919,063.35
5. Step 5: Solve for x
   x = 130,919,063.35/12,379.95
6. Step 6: Final answer
   x = 10,575.09