Finding the Fourth Proportional to 2,685.38, 4,028.55 and 836.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,685.38 : 4,028.55 = 836.18 : x
2. Step 2: Convert to fraction form
   2,685.38/4,028.55 = 836.18/x
3. Step 3: Cross multiply
   2,685.38x = 4,028.55 × 836.18
4. Step 4: Simplify right side
   2,685.38x = 3,368,592.94
5. Step 5: Solve for x
   x = 3,368,592.94/2,685.38
6. Step 6: Final answer
   x = 1,254.42