Finding the Fourth Proportional to 2,160.96, 2,982.06 and 1,216.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.96 : 2,982.06 = 1,216.80 : x
2. Step 2: Convert to fraction form
   2,160.96/2,982.06 = 1,216.80/x
3. Step 3: Cross multiply
   2,160.96x = 2,982.06 × 1,216.80
4. Step 4: Simplify right side
   2,160.96x = 3,628,570.61
5. Step 5: Solve for x
   x = 3,628,570.61/2,160.96
6. Step 6: Final answer
   x = 1,679.15