Finding the Fourth Proportional to 13,105.96, 19,655.49 and 8,945.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.96 : 19,655.49 = 8,945.20 : x
2. Step 2: Convert to fraction form
   13,105.96/19,655.49 = 8,945.20/x
3. Step 3: Cross multiply
   13,105.96x = 19,655.49 × 8,945.20
4. Step 4: Simplify right side
   13,105.96x = 175,822,289.15
5. Step 5: Solve for x
   x = 175,822,289.15/13,105.96
6. Step 6: Final answer
   x = 13,415.45