Finding the Fourth Proportional to 2,085.91, 3,128.93 and 852.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.91 : 3,128.93 = 852.46 : x
2. Step 2: Convert to fraction form
   2,085.91/3,128.93 = 852.46/x
3. Step 3: Cross multiply
   2,085.91x = 3,128.93 × 852.46
4. Step 4: Simplify right side
   2,085.91x = 2,667,291.98
5. Step 5: Solve for x
   x = 2,667,291.98/2,085.91
6. Step 6: Final answer
   x = 1,278.72