Finding the Fourth Proportional to 12,606.84, 17,401.64 and 8,639.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,606.84 : 17,401.64 = 8,639.46 : x
2. Step 2: Convert to fraction form
   12,606.84/17,401.64 = 8,639.46/x
3. Step 3: Cross multiply
   12,606.84x = 17,401.64 × 8,639.46
4. Step 4: Simplify right side
   12,606.84x = 150,340,729.52
5. Step 5: Solve for x
   x = 150,340,729.52/12,606.84
6. Step 6: Final answer
   x = 11,925.33