Finding the Fourth Proportional to 8,131.74, 12,126.59 and 7,235.79

Step by Step Solution

1. Step 1: Write the proportion equation
   8,131.74 : 12,126.59 = 7,235.79 : x
2. Step 2: Convert to fraction form
   8,131.74/12,126.59 = 7,235.79/x
3. Step 3: Cross multiply
   8,131.74x = 12,126.59 × 7,235.79
4. Step 4: Simplify right side
   8,131.74x = 87,745,422.48
5. Step 5: Solve for x
   x = 87,745,422.48/8,131.74
6. Step 6: Final answer
   x = 10,790.49