Finding the Fourth Proportional to 10,200.75, 15,286.77 and 8,111.49

Step by Step Solution

1. Step 1: Write the proportion equation
   10,200.75 : 15,286.77 = 8,111.49 : x
2. Step 2: Convert to fraction form
   10,200.75/15,286.77 = 8,111.49/x
3. Step 3: Cross multiply
   10,200.75x = 15,286.77 × 8,111.49
4. Step 4: Simplify right side
   10,200.75x = 123,998,365.00
5. Step 5: Solve for x
   x = 123,998,365.00/10,200.75
6. Step 6: Final answer
   x = 12,155.81