Finding the Fourth Proportional to 2,189.76, 3,022.56 and 2,116.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.76 : 3,022.56 = 2,116.80 : x
2. Step 2: Convert to fraction form
   2,189.76/3,022.56 = 2,116.80/x
3. Step 3: Cross multiply
   2,189.76x = 3,022.56 × 2,116.80
4. Step 4: Simplify right side
   2,189.76x = 6,398,155.01
5. Step 5: Solve for x
   x = 6,398,155.01/2,189.76
6. Step 6: Final answer
   x = 2,921.85