Finding the Fourth Proportional to 2,196.68, 3,031.04 and 1,312.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.68 : 3,031.04 = 1,312.56 : x
2. Step 2: Convert to fraction form
   2,196.68/3,031.04 = 1,312.56/x
3. Step 3: Cross multiply
   2,196.68x = 3,031.04 × 1,312.56
4. Step 4: Simplify right side
   2,196.68x = 3,978,421.86
5. Step 5: Solve for x
   x = 3,978,421.86/2,196.68
6. Step 6: Final answer
   x = 1,811.11