Finding the Fourth Proportional to 7,018.56, 10,520.52 and 2,856.90

Step by Step Solution

1. Step 1: Write the proportion equation
   7,018.56 : 10,520.52 = 2,856.90 : x
2. Step 2: Convert to fraction form
   7,018.56/10,520.52 = 2,856.90/x
3. Step 3: Cross multiply
   7,018.56x = 10,520.52 × 2,856.90
4. Step 4: Simplify right side
   7,018.56x = 30,056,073.59
5. Step 5: Solve for x
   x = 30,056,073.59/7,018.56
6. Step 6: Final answer
   x = 4,282.37