Finding the Fourth Proportional to 2,103.77, 3,156.56 and 1,128.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.77 : 3,156.56 = 1,128.73 : x
2. Step 2: Convert to fraction form
   2,103.77/3,156.56 = 1,128.73/x
3. Step 3: Cross multiply
   2,103.77x = 3,156.56 × 1,128.73
4. Step 4: Simplify right side
   2,103.77x = 3,562,897.73
5. Step 5: Solve for x
   x = 3,562,897.73/2,103.77
6. Step 6: Final answer
   x = 1,693.58