Finding the Fourth Proportional to 2,113.28, 3,168.24 and 1,072.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.28 : 3,168.24 = 1,072.32 : x
2. Step 2: Convert to fraction form
   2,113.28/3,168.24 = 1,072.32/x
3. Step 3: Cross multiply
   2,113.28x = 3,168.24 × 1,072.32
4. Step 4: Simplify right side
   2,113.28x = 3,397,367.12
5. Step 5: Solve for x
   x = 3,397,367.12/2,113.28
6. Step 6: Final answer
   x = 1,607.63