Finding the Fourth Proportional to 2,128.98, 3,196.46 and 1,089.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.98 : 3,196.46 = 1,089.73 : x
2. Step 2: Convert to fraction form
   2,128.98/3,196.46 = 1,089.73/x
3. Step 3: Cross multiply
   2,128.98x = 3,196.46 × 1,089.73
4. Step 4: Simplify right side
   2,128.98x = 3,483,278.36
5. Step 5: Solve for x
   x = 3,483,278.36/2,128.98
6. Step 6: Final answer
   x = 1,636.13