Finding the Fourth Proportional to 2,064.78, 3,098.26 and 1,128.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,064.78 : 3,098.26 = 1,128.40 : x
2. Step 2: Convert to fraction form
   2,064.78/3,098.26 = 1,128.40/x
3. Step 3: Cross multiply
   2,064.78x = 3,098.26 × 1,128.40
4. Step 4: Simplify right side
   2,064.78x = 3,496,076.58
5. Step 5: Solve for x
   x = 3,496,076.58/2,064.78
6. Step 6: Final answer
   x = 1,693.20