Finding the Fourth Proportional to 2,159.05, 3,238.43 and 842.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.05 : 3,238.43 = 842.56 : x
2. Step 2: Convert to fraction form
   2,159.05/3,238.43 = 842.56/x
3. Step 3: Cross multiply
   2,159.05x = 3,238.43 × 842.56
4. Step 4: Simplify right side
   2,159.05x = 2,728,564.01
5. Step 5: Solve for x
   x = 2,728,564.01/2,159.05
6. Step 6: Final answer
   x = 1,263.78