Finding the Fourth Proportional to 8,839.69, 13,258.83 and 5,139.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,839.69 : 13,258.83 = 5,139.56 : x
2. Step 2: Convert to fraction form
   8,839.69/13,258.83 = 5,139.56/x
3. Step 3: Cross multiply
   8,839.69x = 13,258.83 × 5,139.56
4. Step 4: Simplify right side
   8,839.69x = 68,144,552.31
5. Step 5: Solve for x
   x = 68,144,552.31/8,839.69
6. Step 6: Final answer
   x = 7,708.93