Finding the Fourth Proportional to 8,568.34, 12,826.59 and 7,920.34

Step by Step Solution

1. Step 1: Write the proportion equation
   8,568.34 : 12,826.59 = 7,920.34 : x
2. Step 2: Convert to fraction form
   8,568.34/12,826.59 = 7,920.34/x
3. Step 3: Cross multiply
   8,568.34x = 12,826.59 × 7,920.34
4. Step 4: Simplify right side
   8,568.34x = 101,590,953.84
5. Step 5: Solve for x
   x = 101,590,953.84/8,568.34
6. Step 6: Final answer
   x = 11,856.55