Finding the Fourth Proportional to 8,846.84, 12,129.51 and 8,688.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,846.84 : 12,129.51 = 8,688.89 : x
2. Step 2: Convert to fraction form
   8,846.84/12,129.51 = 8,688.89/x
3. Step 3: Cross multiply
   8,846.84x = 12,129.51 × 8,688.89
4. Step 4: Simplify right side
   8,846.84x = 105,391,917.50
5. Step 5: Solve for x
   x = 105,391,917.50/8,846.84
6. Step 6: Final answer
   x = 11,912.95