Finding the Fourth Proportional to 13,456.94, 18,568.24 and 8,419.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,456.94 : 18,568.24 = 8,419.55 : x
2. Step 2: Convert to fraction form
   13,456.94/18,568.24 = 8,419.55/x
3. Step 3: Cross multiply
   13,456.94x = 18,568.24 × 8,419.55
4. Step 4: Simplify right side
   13,456.94x = 156,336,111.20
5. Step 5: Solve for x
   x = 156,336,111.20/13,456.94
6. Step 6: Final answer
   x = 11,617.51