Finding the Fourth Proportional to 2,085.75, 3,128.61 and 836.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.75 : 3,128.61 = 836.91 : x
2. Step 2: Convert to fraction form
   2,085.75/3,128.61 = 836.91/x
3. Step 3: Cross multiply
   2,085.75x = 3,128.61 × 836.91
4. Step 4: Simplify right side
   2,085.75x = 2,618,365.00
5. Step 5: Solve for x
   x = 2,618,365.00/2,085.75
6. Step 6: Final answer
   x = 1,255.36