Finding the Fourth Proportional to 2,085.86, 3,128.78 and 837.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.86 : 3,128.78 = 837.01 : x
2. Step 2: Convert to fraction form
   2,085.86/3,128.78 = 837.01/x
3. Step 3: Cross multiply
   2,085.86x = 3,128.78 × 837.01
4. Step 4: Simplify right side
   2,085.86x = 2,618,820.15
5. Step 5: Solve for x
   x = 2,618,820.15/2,085.86
6. Step 6: Final answer
   x = 1,255.51