Finding the Fourth Proportional to 2,112.10, 3,168.15 and 1,728.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.10 : 3,168.15 = 1,728.10 : x
2. Step 2: Convert to fraction form
   2,112.10/3,168.15 = 1,728.10/x
3. Step 3: Cross multiply
   2,112.10x = 3,168.15 × 1,728.10
4. Step 4: Simplify right side
   2,112.10x = 5,474,880.02
5. Step 5: Solve for x
   x = 5,474,880.02/2,112.10
6. Step 6: Final answer
   x = 2,592.15