Finding the Fourth Proportional to 2,102.88, 3,152.16 and 1,128.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,102.88 : 3,152.16 = 1,128.72 : x
2. Step 2: Convert to fraction form
   2,102.88/3,152.16 = 1,128.72/x
3. Step 3: Cross multiply
   2,102.88x = 3,152.16 × 1,128.72
4. Step 4: Simplify right side
   2,102.88x = 3,557,906.04
5. Step 5: Solve for x
   x = 3,557,906.04/2,102.88
6. Step 6: Final answer
   x = 1,691.92