Finding the Fourth Proportional to 12,709.60, 19,026.72 and 12,168.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,709.60 : 19,026.72 = 12,168.28 : x
2. Step 2: Convert to fraction form
   12,709.60/19,026.72 = 12,168.28/x
3. Step 3: Cross multiply
   12,709.60x = 19,026.72 × 12,168.28
4. Step 4: Simplify right side
   12,709.60x = 231,522,456.44
5. Step 5: Solve for x
   x = 231,522,456.44/12,709.60
6. Step 6: Final answer
   x = 18,216.34