Finding the Fourth Proportional to 2,078.16, 3,117.67 and 845.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.16 : 3,117.67 = 845.57 : x
2. Step 2: Convert to fraction form
   2,078.16/3,117.67 = 845.57/x
3. Step 3: Cross multiply
   2,078.16x = 3,117.67 × 845.57
4. Step 4: Simplify right side
   2,078.16x = 2,636,208.22
5. Step 5: Solve for x
   x = 2,636,208.22/2,078.16
6. Step 6: Final answer
   x = 1,268.53