Finding the Fourth Proportional to 2,078.49, 3,117.69 and 845.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.49 : 3,117.69 = 845.57 : x
2. Step 2: Convert to fraction form
   2,078.49/3,117.69 = 845.57/x
3. Step 3: Cross multiply
   2,078.49x = 3,117.69 × 845.57
4. Step 4: Simplify right side
   2,078.49x = 2,636,232.93
5. Step 5: Solve for x
   x = 2,636,232.93/2,078.49
6. Step 6: Final answer
   x = 1,268.34