Finding the Fourth Proportional to 1,890.82, 2,835.52 and 850.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,890.82 : 2,835.52 = 850.78 : x
2. Step 2: Convert to fraction form
   1,890.82/2,835.52 = 850.78/x
3. Step 3: Cross multiply
   1,890.82x = 2,835.52 × 850.78
4. Step 4: Simplify right side
   1,890.82x = 2,412,394.49
5. Step 5: Solve for x
   x = 2,412,394.49/1,890.82
6. Step 6: Final answer
   x = 1,275.85