Finding the Fourth Proportional to 5,353.05, 8,020.78 and 5,147.98

Step by Step Solution

1. Step 1: Write the proportion equation
   5,353.05 : 8,020.78 = 5,147.98 : x
2. Step 2: Convert to fraction form
   5,353.05/8,020.78 = 5,147.98/x
3. Step 3: Cross multiply
   5,353.05x = 8,020.78 × 5,147.98
4. Step 4: Simplify right side
   5,353.05x = 41,290,815.02
5. Step 5: Solve for x
   x = 41,290,815.02/5,353.05
6. Step 6: Final answer
   x = 7,713.51