Finding the Fourth Proportional to 2,011.50, 3,018.60 and 857.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,011.50 : 3,018.60 = 857.52 : x
2. Step 2: Convert to fraction form
   2,011.50/3,018.60 = 857.52/x
3. Step 3: Cross multiply
   2,011.50x = 3,018.60 × 857.52
4. Step 4: Simplify right side
   2,011.50x = 2,588,509.87
5. Step 5: Solve for x
   x = 2,588,509.87/2,011.50
6. Step 6: Final answer
   x = 1,286.86