Finding the Fourth Proportional to 10,420.82, 15,665.10 and 8,363.37

Step by Step Solution

1. Step 1: Write the proportion equation
   10,420.82 : 15,665.10 = 8,363.37 : x
2. Step 2: Convert to fraction form
   10,420.82/15,665.10 = 8,363.37/x
3. Step 3: Cross multiply
   10,420.82x = 15,665.10 × 8,363.37
4. Step 4: Simplify right side
   10,420.82x = 131,013,027.39
5. Step 5: Solve for x
   x = 131,013,027.39/10,420.82
6. Step 6: Final answer
   x = 12,572.24