Finding the Fourth Proportional to 5,086.72, 7,019.84 and 2,991.36

Step by Step Solution

1. Step 1: Write the proportion equation
   5,086.72 : 7,019.84 = 2,991.36 : x
2. Step 2: Convert to fraction form
   5,086.72/7,019.84 = 2,991.36/x
3. Step 3: Cross multiply
   5,086.72x = 7,019.84 × 2,991.36
4. Step 4: Simplify right side
   5,086.72x = 20,998,868.58
5. Step 5: Solve for x
   x = 20,998,868.58/5,086.72
6. Step 6: Final answer
   x = 4,128.17