Finding the Fourth Proportional to 10,638.69, 15,960.33 and 5,304.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,638.69 : 15,960.33 = 5,304.78 : x
2. Step 2: Convert to fraction form
   10,638.69/15,960.33 = 5,304.78/x
3. Step 3: Cross multiply
   10,638.69x = 15,960.33 × 5,304.78
4. Step 4: Simplify right side
   10,638.69x = 84,666,039.38
5. Step 5: Solve for x
   x = 84,666,039.38/10,638.69
6. Step 6: Final answer
   x = 7,958.31