Finding the Fourth Proportional to 2,186.42, 3,281.25 and 1,213.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,186.42 : 3,281.25 = 1,213.34 : x
2. Step 2: Convert to fraction form
   2,186.42/3,281.25 = 1,213.34/x
3. Step 3: Cross multiply
   2,186.42x = 3,281.25 × 1,213.34
4. Step 4: Simplify right side
   2,186.42x = 3,981,271.88
5. Step 5: Solve for x
   x = 3,981,271.88/2,186.42
6. Step 6: Final answer
   x = 1,820.91