Finding the Fourth Proportional to 5,086.72, 7,019.24 and 2,990.48

Step by Step Solution

1. Step 1: Write the proportion equation
   5,086.72 : 7,019.24 = 2,990.48 : x
2. Step 2: Convert to fraction form
   5,086.72/7,019.24 = 2,990.48/x
3. Step 3: Cross multiply
   5,086.72x = 7,019.24 × 2,990.48
4. Step 4: Simplify right side
   5,086.72x = 20,990,896.84
5. Step 5: Solve for x
   x = 20,990,896.84/5,086.72
6. Step 6: Final answer
   x = 4,126.61