Finding the Fourth Proportional to 2,144.79, 3,215.79 and 1,412.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.79 : 3,215.79 = 1,412.15 : x
2. Step 2: Convert to fraction form
   2,144.79/3,215.79 = 1,412.15/x
3. Step 3: Cross multiply
   2,144.79x = 3,215.79 × 1,412.15
4. Step 4: Simplify right side
   2,144.79x = 4,541,161.77
5. Step 5: Solve for x
   x = 4,541,161.77/2,144.79
6. Step 6: Final answer
   x = 2,117.30