Finding the Fourth Proportional to 2,196.52, 3,031.12 and 1,311.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.52 : 3,031.12 = 1,311.80 : x
2. Step 2: Convert to fraction form
   2,196.52/3,031.12 = 1,311.80/x
3. Step 3: Cross multiply
   2,196.52x = 3,031.12 × 1,311.80
4. Step 4: Simplify right side
   2,196.52x = 3,976,209.70
5. Step 5: Solve for x
   x = 3,976,209.70/2,196.52
6. Step 6: Final answer
   x = 1,810.23