Finding the Fourth Proportional to 2,150.78, 3,225.90 and 852.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,150.78 : 3,225.90 = 852.35 : x
2. Step 2: Convert to fraction form
   2,150.78/3,225.90 = 852.35/x
3. Step 3: Cross multiply
   2,150.78x = 3,225.90 × 852.35
4. Step 4: Simplify right side
   2,150.78x = 2,749,595.87
5. Step 5: Solve for x
   x = 2,749,595.87/2,150.78
6. Step 6: Final answer
   x = 1,278.42