Finding the Fourth Proportional to 12,346.47, 17,040.78 and 7,869.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,346.47 : 17,040.78 = 7,869.15 : x
2. Step 2: Convert to fraction form
   12,346.47/17,040.78 = 7,869.15/x
3. Step 3: Cross multiply
   12,346.47x = 17,040.78 × 7,869.15
4. Step 4: Simplify right side
   12,346.47x = 134,096,453.94
5. Step 5: Solve for x
   x = 134,096,453.94/12,346.47
6. Step 6: Final answer
   x = 10,861.12