Finding the Fourth Proportional to 2,012.10, 3,015.45 and 856.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.10 : 3,015.45 = 856.50 : x
2. Step 2: Convert to fraction form
   2,012.10/3,015.45 = 856.50/x
3. Step 3: Cross multiply
   2,012.10x = 3,015.45 × 856.50
4. Step 4: Simplify right side
   2,012.10x = 2,582,732.93
5. Step 5: Solve for x
   x = 2,582,732.93/2,012.10
6. Step 6: Final answer
   x = 1,283.60