Finding the Fourth Proportional to 1,568.69, 2,164.60 and 905.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.69 : 2,164.60 = 905.54 : x
2. Step 2: Convert to fraction form
   1,568.69/2,164.60 = 905.54/x
3. Step 3: Cross multiply
   1,568.69x = 2,164.60 × 905.54
4. Step 4: Simplify right side
   1,568.69x = 1,960,131.88
5. Step 5: Solve for x
   x = 1,960,131.88/1,568.69
6. Step 6: Final answer
   x = 1,249.53