Finding the Fourth Proportional to 7,019.56, 10,522.02 and 2,857.90

Step by Step Solution

1. Step 1: Write the proportion equation
   7,019.56 : 10,522.02 = 2,857.90 : x
2. Step 2: Convert to fraction form
   7,019.56/10,522.02 = 2,857.90/x
3. Step 3: Cross multiply
   7,019.56x = 10,522.02 × 2,857.90
4. Step 4: Simplify right side
   7,019.56x = 30,070,880.96
5. Step 5: Solve for x
   x = 30,070,880.96/7,019.56
6. Step 6: Final answer
   x = 4,283.87