Finding the Fourth Proportional to 5,178.27, 7,146.09 and 2,820.45

Step by Step Solution

1. Step 1: Write the proportion equation
   5,178.27 : 7,146.09 = 2,820.45 : x
2. Step 2: Convert to fraction form
   5,178.27/7,146.09 = 2,820.45/x
3. Step 3: Cross multiply
   5,178.27x = 7,146.09 × 2,820.45
4. Step 4: Simplify right side
   5,178.27x = 20,155,189.54
5. Step 5: Solve for x
   x = 20,155,189.54/5,178.27
6. Step 6: Final answer
   x = 3,892.26