Finding the Fourth Proportional to 2,196.93, 3,031.68 and 1,312.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.93 : 3,031.68 = 1,312.21 : x
2. Step 2: Convert to fraction form
   2,196.93/3,031.68 = 1,312.21/x
3. Step 3: Cross multiply
   2,196.93x = 3,031.68 × 1,312.21
4. Step 4: Simplify right side
   2,196.93x = 3,978,185.65
5. Step 5: Solve for x
   x = 3,978,185.65/2,196.93
6. Step 6: Final answer
   x = 1,810.79