Finding the Fourth Proportional to 2,141.53, 3,211.89 and 680.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,141.53 : 3,211.89 = 680.70 : x
2. Step 2: Convert to fraction form
   2,141.53/3,211.89 = 680.70/x
3. Step 3: Cross multiply
   2,141.53x = 3,211.89 × 680.70
4. Step 4: Simplify right side
   2,141.53x = 2,186,317.46
5. Step 5: Solve for x
   x = 2,186,317.46/2,141.53
6. Step 6: Final answer
   x = 1,020.91