Finding the Fourth Proportional to 2,079.20, 3,114.78 and 1,638.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,079.20 : 3,114.78 = 1,638.12 : x
2. Step 2: Convert to fraction form
   2,079.20/3,114.78 = 1,638.12/x
3. Step 3: Cross multiply
   2,079.20x = 3,114.78 × 1,638.12
4. Step 4: Simplify right side
   2,079.20x = 5,102,383.41
5. Step 5: Solve for x
   x = 5,102,383.41/2,079.20
6. Step 6: Final answer
   x = 2,454.01