Finding the Fourth Proportional to 1,385.39, 2,078.28 and 837.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.39 : 2,078.28 = 837.83 : x
2. Step 2: Convert to fraction form
   1,385.39/2,078.28 = 837.83/x
3. Step 3: Cross multiply
   1,385.39x = 2,078.28 × 837.83
4. Step 4: Simplify right side
   1,385.39x = 1,741,234.94
5. Step 5: Solve for x
   x = 1,741,234.94/1,385.39
6. Step 6: Final answer
   x = 1,256.86