Finding the Fourth Proportional to 2,196.81, 3,031.79 and 1,312.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.81 : 3,031.79 = 1,312.59 : x
2. Step 2: Convert to fraction form
   2,196.81/3,031.79 = 1,312.59/x
3. Step 3: Cross multiply
   2,196.81x = 3,031.79 × 1,312.59
4. Step 4: Simplify right side
   2,196.81x = 3,979,497.24
5. Step 5: Solve for x
   x = 3,979,497.24/2,196.81
6. Step 6: Final answer
   x = 1,811.49