Finding the Fourth Proportional to 2,195.81, 3,030.41 and 1,311.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,195.81 : 3,030.41 = 1,311.59 : x
2. Step 2: Convert to fraction form
   2,195.81/3,030.41 = 1,311.59/x
3. Step 3: Cross multiply
   2,195.81x = 3,030.41 × 1,311.59
4. Step 4: Simplify right side
   2,195.81x = 3,974,666.31
5. Step 5: Solve for x
   x = 3,974,666.31/2,195.81
6. Step 6: Final answer
   x = 1,810.11