Finding the Fourth Proportional to 5,172.73, 7,138.31 and 2,814.89

Step by Step Solution

1. Step 1: Write the proportion equation
   5,172.73 : 7,138.31 = 2,814.89 : x
2. Step 2: Convert to fraction form
   5,172.73/7,138.31 = 2,814.89/x
3. Step 3: Cross multiply
   5,172.73x = 7,138.31 × 2,814.89
4. Step 4: Simplify right side
   5,172.73x = 20,093,528.78
5. Step 5: Solve for x
   x = 20,093,528.78/5,172.73
6. Step 6: Final answer
   x = 3,884.51