Finding the Fourth Proportional to 3,422.15, 5,142.49 and 1,863.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,422.15 : 5,142.49 = 1,863.30 : x
2. Step 2: Convert to fraction form
   3,422.15/5,142.49 = 1,863.30/x
3. Step 3: Cross multiply
   3,422.15x = 5,142.49 × 1,863.30
4. Step 4: Simplify right side
   3,422.15x = 9,581,996.96
5. Step 5: Solve for x
   x = 9,581,996.96/3,422.15
6. Step 6: Final answer
   x = 2,800.00