Finding the Fourth Proportional to 12,196.94, 16,815.06 and 7,718.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,196.94 : 16,815.06 = 7,718.45 : x
2. Step 2: Convert to fraction form
   12,196.94/16,815.06 = 7,718.45/x
3. Step 3: Cross multiply
   12,196.94x = 16,815.06 × 7,718.45
4. Step 4: Simplify right side
   12,196.94x = 129,786,115.78
5. Step 5: Solve for x
   x = 129,786,115.78/12,196.94
6. Step 6: Final answer
   x = 10,640.88