Finding the Fourth Proportional to 1,928.49, 2,661.31 and 1,089.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,928.49 : 2,661.31 = 1,089.15 : x
2. Step 2: Convert to fraction form
   1,928.49/2,661.31 = 1,089.15/x
3. Step 3: Cross multiply
   1,928.49x = 2,661.31 × 1,089.15
4. Step 4: Simplify right side
   1,928.49x = 2,898,556.03
5. Step 5: Solve for x
   x = 2,898,556.03/1,928.49
6. Step 6: Final answer
   x = 1,503.02