Finding the Fourth Proportional to 2,103.36, 3,153.60 and 1,128.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.36 : 3,153.60 = 1,128.48 : x
2. Step 2: Convert to fraction form
   2,103.36/3,153.60 = 1,128.48/x
3. Step 3: Cross multiply
   2,103.36x = 3,153.60 × 1,128.48
4. Step 4: Simplify right side
   2,103.36x = 3,558,774.53
5. Step 5: Solve for x
   x = 3,558,774.53/2,103.36
6. Step 6: Final answer
   x = 1,691.95