Finding the Fourth Proportional to 2,160.38, 3,238.59 and 845

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.38 : 3,238.59 = 845 : x
2. Step 2: Convert to fraction form
   2,160.38/3,238.59 = 845/x
3. Step 3: Cross multiply
   2,160.38x = 3,238.59 × 845
4. Step 4: Simplify right side
   2,160.38x = 2,736,608.55
5. Step 5: Solve for x
   x = 2,736,608.55/2,160.38
6. Step 6: Final answer
   x = 1,266.73