Finding the Fourth Proportional to 2,146.18, 3,219.48 and 685.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,146.18 : 3,219.48 = 685.56 : x
2. Step 2: Convert to fraction form
   2,146.18/3,219.48 = 685.56/x
3. Step 3: Cross multiply
   2,146.18x = 3,219.48 × 685.56
4. Step 4: Simplify right side
   2,146.18x = 2,207,146.71
5. Step 5: Solve for x
   x = 2,207,146.71/2,146.18
6. Step 6: Final answer
   x = 1,028.41