Finding the Fourth Proportional to 2,140.46, 3,210.71 and 679.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.46 : 3,210.71 = 679.50 : x
2. Step 2: Convert to fraction form
   2,140.46/3,210.71 = 679.50/x
3. Step 3: Cross multiply
   2,140.46x = 3,210.71 × 679.50
4. Step 4: Simplify right side
   2,140.46x = 2,181,677.45
5. Step 5: Solve for x
   x = 2,181,677.45/2,140.46
6. Step 6: Final answer
   x = 1,019.26