Finding the Fourth Proportional to 3,478.21, 5,215.91 and 2,018.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,478.21 : 5,215.91 = 2,018.38 : x
2. Step 2: Convert to fraction form
   3,478.21/5,215.91 = 2,018.38/x
3. Step 3: Cross multiply
   3,478.21x = 5,215.91 × 2,018.38
4. Step 4: Simplify right side
   3,478.21x = 10,527,688.43
5. Step 5: Solve for x
   x = 10,527,688.43/3,478.21
6. Step 6: Final answer
   x = 3,026.75