Finding the Fourth Proportional to 10,839.90, 16,187.48 and 10,286.34

Step by Step Solution

1. Step 1: Write the proportion equation
   10,839.90 : 16,187.48 = 10,286.34 : x
2. Step 2: Convert to fraction form
   10,839.90/16,187.48 = 10,286.34/x
3. Step 3: Cross multiply
   10,839.90x = 16,187.48 × 10,286.34
4. Step 4: Simplify right side
   10,839.90x = 166,509,871.59
5. Step 5: Solve for x
   x = 166,509,871.59/10,839.90
6. Step 6: Final answer
   x = 15,360.83