Finding the Fourth Proportional to 7,019.89, 10,520.74 and 2,855.06

Step by Step Solution

1. Step 1: Write the proportion equation
   7,019.89 : 10,520.74 = 2,855.06 : x
2. Step 2: Convert to fraction form
   7,019.89/10,520.74 = 2,855.06/x
3. Step 3: Cross multiply
   7,019.89x = 10,520.74 × 2,855.06
4. Step 4: Simplify right side
   7,019.89x = 30,037,317.88
5. Step 5: Solve for x
   x = 30,037,317.88/7,019.89
6. Step 6: Final answer
   x = 4,278.89