Finding the Fourth Proportional to 2,141.78, 3,212.69 and 908.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,141.78 : 3,212.69 = 908.42 : x
2. Step 2: Convert to fraction form
   2,141.78/3,212.69 = 908.42/x
3. Step 3: Cross multiply
   2,141.78x = 3,212.69 × 908.42
4. Step 4: Simplify right side
   2,141.78x = 2,918,451.24
5. Step 5: Solve for x
   x = 2,918,451.24/2,141.78
6. Step 6: Final answer
   x = 1,362.63