Finding the Fourth Proportional to 5,172.16, 7,137.72 and 2,814.40

Step by Step Solution

1. Step 1: Write the proportion equation
   5,172.16 : 7,137.72 = 2,814.40 : x
2. Step 2: Convert to fraction form
   5,172.16/7,137.72 = 2,814.40/x
3. Step 3: Cross multiply
   5,172.16x = 7,137.72 × 2,814.40
4. Step 4: Simplify right side
   5,172.16x = 20,088,399.17
5. Step 5: Solve for x
   x = 20,088,399.17/5,172.16
6. Step 6: Final answer
   x = 3,883.95