Finding the Fourth Proportional to 2,012.24, 3,016.44 and 856.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.24 : 3,016.44 = 856.40 : x
2. Step 2: Convert to fraction form
   2,012.24/3,016.44 = 856.40/x
3. Step 3: Cross multiply
   2,012.24x = 3,016.44 × 856.40
4. Step 4: Simplify right side
   2,012.24x = 2,583,279.22
5. Step 5: Solve for x
   x = 2,583,279.22/2,012.24
6. Step 6: Final answer
   x = 1,283.78