Finding the Fourth Proportional to 10,938.29, 15,086.78 and 8,249.61

Step by Step Solution

1. Step 1: Write the proportion equation
   10,938.29 : 15,086.78 = 8,249.61 : x
2. Step 2: Convert to fraction form
   10,938.29/15,086.78 = 8,249.61/x
3. Step 3: Cross multiply
   10,938.29x = 15,086.78 × 8,249.61
4. Step 4: Simplify right side
   10,938.29x = 124,460,009.91
5. Step 5: Solve for x
   x = 124,460,009.91/10,938.29
6. Step 6: Final answer
   x = 11,378.38