Finding the Fourth Proportional to 2,196.18, 3,030.04 and 1,311.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.18 : 3,030.04 = 1,311.78 : x
2. Step 2: Convert to fraction form
   2,196.18/3,030.04 = 1,311.78/x
3. Step 3: Cross multiply
   2,196.18x = 3,030.04 × 1,311.78
4. Step 4: Simplify right side
   2,196.18x = 3,974,745.87
5. Step 5: Solve for x
   x = 3,974,745.87/2,196.18
6. Step 6: Final answer
   x = 1,809.85