Finding the Fourth Proportional to 7,019.90, 10,520.70 and 2,855.04

Step by Step Solution

1. Step 1: Write the proportion equation
   7,019.90 : 10,520.70 = 2,855.04 : x
2. Step 2: Convert to fraction form
   7,019.90/10,520.70 = 2,855.04/x
3. Step 3: Cross multiply
   7,019.90x = 10,520.70 × 2,855.04
4. Step 4: Simplify right side
   7,019.90x = 30,037,019.33
5. Step 5: Solve for x
   x = 30,037,019.33/7,019.90
6. Step 6: Final answer
   x = 4,278.84