Finding the Fourth Proportional to 1,568.48, 2,164.56 and 905.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.48 : 2,164.56 = 905.34 : x
2. Step 2: Convert to fraction form
   1,568.48/2,164.56 = 905.34/x
3. Step 3: Cross multiply
   1,568.48x = 2,164.56 × 905.34
4. Step 4: Simplify right side
   1,568.48x = 1,959,662.75
5. Step 5: Solve for x
   x = 1,959,662.75/1,568.48
6. Step 6: Final answer
   x = 1,249.41