Finding the Fourth Proportional to 2,196.24, 3,030.39 and 1,311.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.24 : 3,030.39 = 1,311.72 : x
2. Step 2: Convert to fraction form
   2,196.24/3,030.39 = 1,311.72/x
3. Step 3: Cross multiply
   2,196.24x = 3,030.39 × 1,311.72
4. Step 4: Simplify right side
   2,196.24x = 3,975,023.17
5. Step 5: Solve for x
   x = 3,975,023.17/2,196.24
6. Step 6: Final answer
   x = 1,809.92