Finding the Fourth Proportional to 10,356.15, 15,501.15 and 8,169.15

Step by Step Solution

1. Step 1: Write the proportion equation
   10,356.15 : 15,501.15 = 8,169.15 : x
2. Step 2: Convert to fraction form
   10,356.15/15,501.15 = 8,169.15/x
3. Step 3: Cross multiply
   10,356.15x = 15,501.15 × 8,169.15
4. Step 4: Simplify right side
   10,356.15x = 126,631,219.52
5. Step 5: Solve for x
   x = 126,631,219.52/10,356.15
6. Step 6: Final answer
   x = 12,227.63