Finding the Fourth Proportional to 12,978.60, 17,910.72 and 7,673.44

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.60 : 17,910.72 = 7,673.44 : x
2. Step 2: Convert to fraction form
   12,978.60/17,910.72 = 7,673.44/x
3. Step 3: Cross multiply
   12,978.60x = 17,910.72 × 7,673.44
4. Step 4: Simplify right side
   12,978.60x = 137,436,835.28
5. Step 5: Solve for x
   x = 137,436,835.28/12,978.60
6. Step 6: Final answer
   x = 10,589.50