Finding the Fourth Proportional to 5,311.28, 7,965.86 and 5,047.85

Step by Step Solution

1. Step 1: Write the proportion equation
   5,311.28 : 7,965.86 = 5,047.85 : x
2. Step 2: Convert to fraction form
   5,311.28/7,965.86 = 5,047.85/x
3. Step 3: Cross multiply
   5,311.28x = 7,965.86 × 5,047.85
4. Step 4: Simplify right side
   5,311.28x = 40,210,401.33
5. Step 5: Solve for x
   x = 40,210,401.33/5,311.28
6. Step 6: Final answer
   x = 7,570.76