Finding the Fourth Proportional to 10,535.09, 15,804.72 and 3,139.38

Step by Step Solution

1. Step 1: Write the proportion equation
   10,535.09 : 15,804.72 = 3,139.38 : x
2. Step 2: Convert to fraction form
   10,535.09/15,804.72 = 3,139.38/x
3. Step 3: Cross multiply
   10,535.09x = 15,804.72 × 3,139.38
4. Step 4: Simplify right side
   10,535.09x = 49,617,021.87
5. Step 5: Solve for x
   x = 49,617,021.87/10,535.09
6. Step 6: Final answer
   x = 4,709.69