Finding the Fourth Proportional to 5,077.89, 7,007.37 and 2,839.80

Step by Step Solution

1. Step 1: Write the proportion equation
   5,077.89 : 7,007.37 = 2,839.80 : x
2. Step 2: Convert to fraction form
   5,077.89/7,007.37 = 2,839.80/x
3. Step 3: Cross multiply
   5,077.89x = 7,007.37 × 2,839.80
4. Step 4: Simplify right side
   5,077.89x = 19,899,529.33
5. Step 5: Solve for x
   x = 19,899,529.33/5,077.89
6. Step 6: Final answer
   x = 3,918.86