Finding the Fourth Proportional to 2,196.42, 3,031.23 and 1,312.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.42 : 3,031.23 = 1,312.20 : x
2. Step 2: Convert to fraction form
   2,196.42/3,031.23 = 1,312.20/x
3. Step 3: Cross multiply
   2,196.42x = 3,031.23 × 1,312.20
4. Step 4: Simplify right side
   2,196.42x = 3,977,580.01
5. Step 5: Solve for x
   x = 3,977,580.01/2,196.42
6. Step 6: Final answer
   x = 1,810.94