Finding the Fourth Proportional to 12,658.78, 18,992.01 and 8,968.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,658.78 : 18,992.01 = 8,968.15 : x
2. Step 2: Convert to fraction form
   12,658.78/18,992.01 = 8,968.15/x
3. Step 3: Cross multiply
   12,658.78x = 18,992.01 × 8,968.15
4. Step 4: Simplify right side
   12,658.78x = 170,323,099.52
5. Step 5: Solve for x
   x = 170,323,099.52/12,658.78
6. Step 6: Final answer
   x = 13,454.94