Finding the Fourth Proportional to 12,388.72, 17,104.44 and 7,678

Step by Step Solution

1. Step 1: Write the proportion equation
   12,388.72 : 17,104.44 = 7,678 : x
2. Step 2: Convert to fraction form
   12,388.72/17,104.44 = 7,678/x
3. Step 3: Cross multiply
   12,388.72x = 17,104.44 × 7,678
4. Step 4: Simplify right side
   12,388.72x = 131,327,890.32
5. Step 5: Solve for x
   x = 131,327,890.32/12,388.72
6. Step 6: Final answer
   x = 10,600.60