Finding the Fourth Proportional to 1,914.05, 2,640.84 and 1,128.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,914.05 : 2,640.84 = 1,128.08 : x
2. Step 2: Convert to fraction form
   1,914.05/2,640.84 = 1,128.08/x
3. Step 3: Cross multiply
   1,914.05x = 2,640.84 × 1,128.08
4. Step 4: Simplify right side
   1,914.05x = 2,979,065.58
5. Step 5: Solve for x
   x = 2,979,065.58/1,914.05
6. Step 6: Final answer
   x = 1,556.42