Finding the Fourth Proportional to 12,978.68, 17,910.60 and 7,676.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.68 : 17,910.60 = 7,676.12 : x
2. Step 2: Convert to fraction form
   12,978.68/17,910.60 = 7,676.12/x
3. Step 3: Cross multiply
   12,978.68x = 17,910.60 × 7,676.12
4. Step 4: Simplify right side
   12,978.68x = 137,483,914.87
5. Step 5: Solve for x
   x = 137,483,914.87/12,978.68
6. Step 6: Final answer
   x = 10,593.06